Jewish Autonomous Oblast in the context of "Federal subjects of Russia"

An autonomous oblast (Russian: Автономная область (АО)) is an autonomous form of an oblast (administrative-territorial structure) in the USSR. Of the post-Soviet states, autonomous oblasts currently exist only in Russia (the Jewish Autonomous Oblast) and Tajikistan (the Gorno-Badakhshan).

There were autonomous oblasts of the Soviet Union and later some federal subjects of Russia were autonomous oblasts: the one remaining is the Jewish Autonomous Oblast. Eastern Rumelia was an autonomous province (oblast in Bulgarian, one of its official languages) of the Ottoman Empire. Serb Autonomous Regions are known as oblasts.

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.

Khabarovsk Krai (Russian: Хабаровский край, romanized: Khabarovskiy kray, IPA: [xɐˈbarəfskʲɪj kraj]) is a federal subject (a krai) of Russia. It is located in the Russian Far East and is administratively part of the Far Eastern Federal District. The administrative centre of the krai is the city of Khabarovsk, which is home to roughly half of the krai's population and the largest city in the Russian Far East (just ahead of Vladivostok). Khabarovsk Krai is the third-largest federal subject by area, and had a population of 1,343,869 as of 2010.

Being dominated by the Siberian High winter cold, the continental climates of the krai see extreme freezing for an area adjacent to the sea near the mid-latitudes, but also warm summers in the interior. The southern region lies mostly in the basin of the lower Amur River, with the mouth of the river located at Nikolaevsk-on-Amur draining into the Strait of Tartary, which separates Khabarovsk Krai from the island of Sakhalin. The north occupies a vast mountainous area along the coastline of the Sea of Okhotsk, a marginal sea of the Pacific Ocean. Khabarovsk Krai is bordered by Magadan Oblast to the north; Amur Oblast, Jewish Autonomous Oblast, and the Sakha Republic to the west; Primorsky Krai to the south; and Sakhalin Oblast to the east.

Heilongjiang is a province in northeast China. It is the northernmost and easternmost province of the country and contains China's northernmost point (in Mohe City along the Amur) and easternmost point (at the confluence of the Amur and Ussuri rivers).

The province is bordered by Jilin to the south and Inner Mongolia to the west. It also shares a border with Russia (Amur Oblast, Jewish Autonomous Oblast, Khabarovsk Krai, Primorsky Krai and Zabaykalsky Krai) to the north and east. The capital and the largest city of the province is Harbin. Among Chinese provincial-level administrative divisions, Heilongjiang is the sixth-largest by total area, the 20th-most populous, and the second-poorest by GDP per capita after only Gansu province.

Russia, as the largest country in the world, has great ethnic diversity. It is a multinational state and home to over 190 ethnic groups countrywide. According to the population census at the end of 2021, more than 147.1 million people lived in Russia, which is 4.3 million more than in the 2010 census, or 3.03%. At the same time, only 130.587 million census participants indicated their nationality. The top ten largest nations besides Russians included in descending order: Tatars, Chechens, Bashkirs, Chuvash, Avars, Armenians, Ukrainians, Dargins and Kazakhs. Population censuses in Russia allow citizens to report their nationality according not only to their ancestry, but also to self-identification. The 83 federal subjects which together constitute the Russian Federation include:

• 21 national republics (self-governing regions organized along ethnic lines)
• 4 autonomous okrugs (usually with substantial or predominant ethnic minority)
• 1 autonomous oblast

The Heishui Mohe (Chinese: 黑水靺鞨; pinyin: Hēishuǐ Mòhé; Manchu: Sahaliyan i Aiman or 薩哈廉部; Korean: 흑수말갈; RR: Heuksu malgal), rendered in English as Blackriver Mohe or Blackwater Mohe, were a tribe of Mohe people in Outer Manchuria along the Amur River (Chinese: 黑水; pinyin: Hēi Shuǐ; lit. 'Blackwater" or "Black River') in what is now Russia's Khabarovsk Krai, Amur Oblast, Jewish Autonomous Oblast, and Heilongjiang in China.