Northeast China in the context of "Yukjin dialect"

Manchuria is a region in East Asia. Depending on the definition of its extent, Manchuria can refer either to a region falling entirely within present-day China, or to a larger region today divided between Northeast China and the Russian Far East. To differentiate between the two parts following the latter definition, the Russian part is also known as Outer Manchuria (or Russian Manchuria), while the Chinese part is known as Northeast China.

Manchuria is the homeland of the Manchu people. "Manchu" is a name introduced by Hong Taiji of the Qing dynasty in 1636 for the Jurchen people, a Tungusic people.

Inner Asia refers to the northern and landlocked regions spanning North, Central, and East Asia. It includes parts of western and northeast China, as well as southern Siberia. The area overlaps with some definitions of "Central Asia", mostly the historical ones, but certain regions that are often included in Inner Asia, such as Manchuria, are not a part of Central Asia by any of its definitions. Inner Asia may be regarded as the western and northern "frontier" of China proper and as being bounded by East Asia proper, which consists of China proper, Japan, and Korea.

The extent of Inner Asia has been understood differently in different periods. "Inner Asia" is sometimes contrasted to "China proper", that is, the territories originally unified under the Qin dynasty with majority Han populations. By the year 1800, Chinese Inner Asia consisted of four main areas, namely Manchuria (modern Northeast China and Outer Manchuria), the Mongolian Plateau (Inner Mongolia and Outer Mongolia), Xinjiang (Chinese Turkestan or East Turkestan), and Tibet. Many of these areas had been only recently conquered by the Qing dynasty of China and, during most of the Qing period, they were governed through administrative structures different from those of the older Chinese provinces. A Qing government agency, the Lifan Yuan, supervised the empire's Inner Asian regions, also known as Chinese Tartary. The frontier regions of China proper—Gansu, Qinghai, Sichuan, and Yunnan—are also sometimes included as part of Inner Asia.

The Liao dynasty (/ljaʊ/; Khitan: Mos Jælud; traditional Chinese: 遼朝; simplified Chinese: 辽朝; pinyin: Liáo cháo), also known as the Khitan State (Mos diau-d kitai huldʒi gur), officially the Great Liao (Chinese: 大遼; pinyin: Dà Liáo), was a Khitan-led imperial dynasty of China and empire ruled by the Yelü clan that existed between 916 and 1125. Founded around the time of the collapse of the Tang dynasty, at its greatest extent it ruled over Northeast China, the Mongolian Plateau, the northern part of the Korean Peninsula, southern portions of Siberia, and the northern tip of the North China Plain.

The dynasty rose from the consolidation of power among the Khitans in the 8th century and their expansionist campaigns in the latter half of the 9th century. Eventually the Yila chieftain, Abaoji, became the leader of the Khitans and proclaimed a Chinese-style dynastic state in 916. The Liao dynasty launched multiple military campaigns against neighboring states and peoples including the Kumo Xi, Shiwei, Tatars, Zubu, Khongirad, Balhae, Goryeo, Later Tang, and the Song dynasty. Its conquests include the Sixteen Prefectures (including present-day Beijing and part of Hebei) by fueling a proxy war that led to the collapse of the Later Tang (923–936). In 1004, the Liao launched an expedition against the Northern Song dynasty. After heavy fighting and large casualties between the two empires, both sides worked out the Chanyuan Treaty. Through the treaty, the Liao forced the Northern Song to recognize them as peers and heralded an era of peace and stability between the two powers that lasted approximately 120 years. It was the first state to control all of Manchuria.

Outer Manchuria, sometimes called Russian Manchuria, refers to a region in Northeast Asia that is now part of the Russian Far East but historically formed part of Manchuria (until the mid-19th century). While Manchuria now more normatively refers to Northeast China, it originally included areas consisting of Priamurye between the left bank of Amur River and the Stanovoy Range to the north, and Primorskaya which covered the area in the right bank of both Ussuri River and the lower Amur River to the Pacific Coast. The region was ruled by a series of Chinese dynasties and the Mongol Empire, but control of the area was ceded to the Russian Empire by Qing China during the Amur Annexation in the 1858 Treaty of Aigun and 1860 Treaty of Peking, with the terms "Outer Manchuria" and "Russian Manchuria" arising after the Russian annexation.

Prior to its annexation by Russia, Outer Manchuria was predominantly inhabited by various Tungusic peoples who were categorized by the Han Chinese as "Wild Jurchens". The Evenks, who speak a closely related Tungusic language to Manchu, make up a significant part of the indigenous population today. When the region was a part of the Qing dynasty, a small population of Han Chinese men migrated to Outer Manchuria and married the local Tungusic women. Their mixed descendants would emerge as a distinct ethnic group known as the Taz people.

The Bohai Sea (Chinese: 渤海; pinyin: Bó Hǎi; lit. 'Bo Sea') is a gulf/inland sea approximately 77,000 km (30,000 sq mi) in area on the east coast of Mainland China. It is the northwestern and innermost extension of the Yellow Sea, to which it connects via the Bohai Strait. It has a mean depth of approximately 18 meters (59 ft), with a maximum depth of about 80 meters (260 ft) located in the northern part of the Bohai Strait.

The Bohai Sea is enclosed by three provinces and one direct-administered municipality from three different regions of China—Liaoning Province (of Northeast China), Hebei Province and Tianjin Municipality (of North China), and Shandong Province (of East China). It is the center of the Bohai Economic Rim, and its proximity to the Chinese capital of Beijing and the municipality of Tianjin makes it one of the busiest seaways in the world. The entrance to the Bohai Sea is considered a part of the territorial sea of the People's Republic of China due to the presence of the Miaodao islands. China declared the Bohai sea to be part of its inland waters in 1958.

Manchu (ᠮᠠᠨᠵᡠ
ᡤᡳᠰᡠᠨ Manju gisun) is a critically endangered Tungusic language native to the historical region of Manchuria in Northeast China. As the traditional native language of the Manchus, it was the national language of the Qing dynasty (1644–1912) of China, although today the vast majority of Manchus speak only Mandarin Chinese. Several thousand can speak Manchu as a second language through governmental primary education or free classes for adults in classrooms or online. There are no more native speakers of Manchu as of 2024.

The Manchu language has high historical value for historians of China, especially for the Qing dynasty. Manchu-language texts supply information that is unavailable in Chinese, and when both Manchu and Chinese versions of a given text exist, they provide controls for understanding the Chinese.

Manchuria is a historical region in northeast Asia encompassing the entirety of present-day northeast China and parts of the modern-day Russian Far East south of the Uda River and the Tukuringra-Dzhagdy Ranges. The exact geographical extent varies depending on the definition: in the narrow sense, the area constituted by three Chinese provinces of Heilongjiang, Jilin, and Liaoning as well as the eastern Inner Mongolian prefectures of Hulunbuir, Hinggan, Tongliao, and Chifeng; in a broader sense, historical Manchuria includes those regions plus the Amur river basin, parts of which were ceded to the Russian Empire by the Manchu-led Qing dynasty during the Amur Annexation of 1858–1860. The parts of Manchuria ceded to Russia are collectively known as Outer Manchuria or Russian Manchuria, which include present-day Amur Oblast, Primorsky Krai, the Jewish Autonomous Oblast, the southern part of Khabarovsk Krai, and the eastern edge of Zabaykalsky Krai.

The name Manchuria is an exonym (derived from the endonym "Manchu") of Japanese origin. The history of "Manchuria" (Manzhou) as a toponym in China is disputed, with some scholars believing it was never used while others believe it was by the late 19th century. The area was historically referred to by various names in the Qing dynasty such as Guandong (East of the Pass) or the Three Provinces referring to Fengtian (Liaoning), Heilongjiang, and Jilin. Manchuria as a geographical term was first used in the 18th or 19th centuries by the Japanese before spreading to Europe. The term was promoted by the Empire of Japan in support for the existence of its puppet state, Manchukuo. Although the toponym is still used, some scholars treat the term with caution or avoid it altogether due to its association with Japanese colonialism. The term is deprecated in China due to its association with Japanese imperialism and ethnic connotations. As a result, areas once considered part of Manchuria are simply referred to as the Northeast. The Three Provinces and the Northeast were also in concurrent use among the Japanese along with Manchuria until the Mukden incident of 1931.

Manchukuo, officially known as the State of Manchuria prior to 1934 and the Empire of Great Manchuria thereafter, was a puppet state of the Empire of Japan in Northeast China that existed from 1932 until its dissolution in 1945. It was ostensibly founded as a republic, its territory consisting of the lands seized in the Japanese invasion of Manchuria; it was later declared to be a constitutional monarchy in 1934, though very little changed in the actual functioning of government. Manchukuo received limited diplomatic recognition, primarily from states aligned with the Axis powers, with its existence widely regarded as illegitimate.

The region now known as Manchuria had historically been the homeland of the Manchu people, though by the 20th century they had long since become a minority in the region, with Han Chinese constituting by far the largest ethnic group. The Manchu-led Qing dynasty, which had governed China since 17th century, was overthrown with the permanent abolition of the dynastic system in the 1911 Xinhai Revolution, with Puyi, the final emperor of China, forced to abdicate at the age of six. In 1931, Manchuria was invaded and occupied by the Empire of Japan following the Mukden incident. A puppet government was set up the following year, with Puyi brought in by the Japanese to serve as its nominal regent, though he himself had no actual political power. Japanese officials ultimately made all pertinent decisions, and exercised total control over Puyi's court and personal safety. Upon the nominal transition from republic to empire, Puyi was proclaimed as the emperor of Manchukuo.

The Xianbei (/ʃjɛnˈbeɪ/; simplified Chinese: 鲜卑; traditional Chinese: 鮮卑; pinyin: Xiānbēi) were an ancient nomadic people that once resided in the eastern Eurasian steppes in what is today Mongolia, Inner Mongolia, and Northeastern China. The Xianbei were likely not of a single ethnicity, but rather a multilingual, multi-ethnic confederation consisting of mainly Proto-Mongols (who spoke either pre-Proto-Mongolic, or Para-Mongolic languages), and, to a minor degree, Tungusic and Turkic peoples. They originated from the Donghu people who splintered into the Wuhuan and Xianbei when they were defeated by the Xiongnu at the end of the third century BC. Following the split, the Xianbei people did not have direct contact with the Han dynasty, residing to the north of the Wuhuan. In the first century BC, the Xianbei began actively engaging in the struggle between the Han and Xiongnu, culminating in the Xianbei replacing the Xiongnu on the Mongolian Plateau.

In the mid-2nd century, the chieftain, Tanshihuai unified the Xianbei and waged war against the Han dynasty. His confederation threatened the Han's northern borders for many years, but quickly disintegrated following his death in 181 AD. After suffering several defeats by the end of the Three Kingdoms period, the Xianbei migrated southwards and settled in close proximity to Han society, submitting as vassals to the Chinese dynasties. As one of the so-called "Five Barbarians", they fought as auxiliaries for the Western Jin dynasty during the War of the Eight Princes and the Upheaval of the Five Barbarians before eventually distancing themselves and declaring their autonomy while the Jin were pushed out from northern China. During the Sixteen Kingdoms period, the Xianbei founded several short-lived states and established themselves on the Central Plains.

The Rouran Khaganate (Chinese:柔然; Róurán), also known as Ruanruan or Juan-juan (蠕蠕; Ruǎnruǎn) (or variously Jou-jan, Ruruan, Ju-juan, Ruru, Ruirui, Rouru, Rouruan or Tantan), was a tribal confederation and later state. The Rouran state was undoubtedly multi-ethnic. As the ancient sources regard the Rouran as a separate branch of the Xiongnu Book of Song and Book of Liang connected Rourans to the earlier Xiongnu while the Book of Wei connected them to Proto-Mongolic Donghu. The Rouran supreme rulers used the title of khagan, a popular title borrowed from the Xianbei. The Rouran Khaganate lasted from the late 4th century until the middle 6th century with territory that covered all of modern-day Mongolia and Inner Mongolia, as well as parts of Manchuria in Northeast China, Eastern Siberia, Xinjiang, and Kazakhstan. The Hephthalites were vassals of the Rouran Khaganate until the beginning of the 5th century, with the royal house of Rourans intermarrying with the royal houses of the Hephthalites. The Rouran Khaganate ended when they were defeated by a Göktürk rebellion at the peak of their power, which subsequently led to the rise of the Turks in world history.

Their Khaganate overthrown, some Rouran remnants possibly became Tatars while others possibly migrated west and became the Pannonian Avars (known by such names as Varchonites or Pseudo Avars), who settled in Pannonia (centred on modern Hungary) during the 6th century. These Avars were pursued into the Byzantine Empire by the Göktürks, who referred to the Avars as a slave or vassal people, and requested that the Byzantines expel them. While this Rouran-Avars link remains a controversial theory, a recent DNA study has confirmed the genetic origins of the Avar elite as originating from the Mongolian plains. Other theories instead link the origins of the Pannonian Avars to peoples such as the Uar.