Kamchatka Peninsula in the context of "Okhotsk plate"

The Sea of Okhotsk is a marginal sea of the northwestern Pacific Ocean. It is located between Russia's Kamchatka Peninsula on the east, the Kuril Islands on the southeast, Japan's island of Hokkaido on the south, the island of Sakhalin along the west, and a stretch of eastern Siberian coast along the west and north. Its northeast corner is the Shelikhov Gulf. The sea is named for the port of Okhotsk, itself named for the Okhota River.

The Kuril Islands or Kurile Islands are a volcanic archipelago administered as part of Sakhalin Oblast in the Russian Far East. The islands stretch approximately 1,300 km (810 mi) northeast from Hokkaido in Japan to Kamchatka Peninsula in Russia, separating the Sea of Okhotsk from the north Pacific Ocean. There are 56 islands and many minor islets. The Kuril Islands consist of the Greater Kuril Chain and, at the southwest end, the parallel Lesser Kuril Chain. The group termed the 'South Kurils' consists of those of the Lesser Kuril Chain together with Kunashir and Iturup in the Greater Kuril Chain. The Vries Strait between Iturup and Urup forms the Miyabe Line dividing the North and South Kurils. The Kuril Islands cover an area of around 10,503.2 square kilometres (4,055.3 sq mi), with a population of roughly 20,000.

The islands have been under Russian administration since their 1945 invasion by the Soviet Union near the end of World War II. Japan claims the four southernmost islands, including two of the three largest (Iturup and Kunashir), as part of its territory, as well as Shikotan and the unpopulated Habomai islets, which has led to the ongoing Kuril Islands dispute. The disputed islands are known in Japan as the country's "Northern Territories".

Pumice ( /ˈpʌmɪs/), called pumicite in its powdered or dust form, is a volcanic rock that consists of extremely vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls, and being dark colored and denser.

Pumice is created when super-heated, highly pressurized rock is rapidly ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. The depressurization creates bubbles by lowering the solubility of gases (including water and CO₂) that are dissolved in the lava, causing the gases to rapidly exsolve (like the bubbles of CO₂ that appear when a carbonated drink is opened). The simultaneous cooling and depressurization freeze the bubbles in a matrix. Pumice is fragments of lava or tephra that cooled in air or water. If pumice from an underwater volcanic eruption reaches the water surface, it can form pumice rafts on the water surface that can be a hazard for ships.

Beringia is a prehistoric geographical region, defined as the land and maritime area bounded on the west by the Lena River in Russia; on the east by the Mackenzie River in Canada; on the north by 72° north latitude in the Chukchi Sea; and on the south by the tip of the Kamchatka Peninsula. It includes the Chukchi Sea, the Bering Sea, the Bering Strait, the Chukchi and Kamchatka peninsulas in Russia as well as Alaska in the United States and Yukon in Canada.

The area includes land lying on the North American Plate and Siberian land east of the Chersky Range. At various times, it formed a land bridge referred to as the Bering land bridge or the Bering Strait land bridge that was up to 1,000 km (620 mi) wide at its greatest extent and which covered an area as large as British Columbia and Alberta together, totaling about 1.6 million km (620,000 sq mi), allowing biological dispersal to occur between Asia and North America. Today, the only land that is visible from the central part of the Bering land bridge are the Diomede Islands, the Pribilof Islands of St. Paul and St. George, St. Lawrence Island, St. Matthew Island, and King Island.

The Ainu languages (/ˈaɪnuː/ EYE-noo), sometimes known as Ainuic, were a small language family, often regarded as a language family isolate, historically spoken by the Ainu people of northern Japan and neighboring islands, up to the southern tip of the Kamchatka Peninsula.

The primary varieties of Ainu are alternately considered a group of closely related languages or divergent dialects of a single language isolate. Toponymic evidence suggests Ainu was once spoken in northern Honshu and that much of the historically attested extent of the family was due to a relatively recent expansion northward. No genealogical relationship between Ainu and any other language family has been demonstrated, despite numerous attempts.

Ainu (アイヌ イタㇰ, aynu itak), or more precisely Hokkaido Ainu (Japanese: 北海道アイヌ語), is the native language of the Ainu people on the northern Japanese island of Hokkaido. It is a member of the Ainu language family, itself considered a language family isolate with no academic consensus regarding its origin. Until the 20th century, the Ainu languages – Hokkaido Ainu, Kuril Ainu, and Sakhalin Ainu – were spoken throughout Hokkaido, the southern half of the island of Sakhalin and by small communities in the Kuril Islands, up to the southern tip of Kamchatka.

Following the colonization of Hokkaido, the number of Hokkaido Ainu speakers declined steadily throughout the 20th century. By 2008, Hokkaido Ainu was critically endangered, with only two elderly people reported to speak it as their first language. According to the linguist Hiroshi Nakagawa, by 2021 no one in Japan had Ainu as their first language.

44°6′N 146°42′E / 44.100°N 146.700°E / 44.100; 146.700

Japan and Russia have a territorial dispute over the four southernmost Kuril Islands. The Kuril Islands are a chain of islands that stretch between the Japanese island of Hokkaido at their southern end and the Russian Kamchatka Peninsula at their northern end. The islands separate the Sea of Okhotsk from the Pacific Ocean. The four disputed islands, like other islands in the Kuril chain which are not in dispute, were unilaterally annexed by the Soviet Union following the Invasion of the Kuril Islands at the end of World War II. The disputed islands are under Russian administration as the South Kuril District and part of the Kuril District of the Sakhalin Oblast (Сахалинская область, Sakhalinskaya oblast). They are claimed by Japan, which refers to them as its Northern Territories or Southern Chishima, and considers them part of the Nemuro Subprefecture of Hokkaido Prefecture.

The Okhotsk plate is a minor tectonic plate covering the Kamchatka Peninsula, Magadan Oblast, and Sakhalin Island of Russia; Hokkaido, Kantō and Tōhoku regions of Japan; the Sea of Okhotsk, as well as the disputed Kuril Islands.

Japan's principal fault system is the zone where the Amur plate, the Eastern edge of the Eurasian plate, meets the Okhotsk plate, sometimes considered the Western edge of the North American plate.

Kronotsky (Russian: Кроноцкая сопка, Kronotskaya Sopka) is a major stratovolcano on the Kamchatka Peninsula, Russia. It is located in Kronotsky Nature Reserve to the east of Lake Kronotskoye (the largest freshwater lake in Kamchatka). It has a particularly symmetrical conical shape, comparable to Mount Fuji in Japan and to Mayon Volcano in the Philippines. The summit crater is plugged by a volcanic neck, and the summit itself is ice-capped. It exhibits the classic radial drainage pattern, extending downward from its crater. Kronotsky is considered to be one of the most scenic volcanoes in Kamchatka. In the 20th century, the volcano had low activity, with occasional weak phreatic eruptions. Its latest eruption started on October 4, 2025, with an ash cloud up to 9 km (5.6 mi) high.

Koryaksky or Koryakskaya Sopka (Russian: Коря́кская со́пка) is an active volcano on the Kamchatka Peninsula in the Russian Far East. It lies within sight of Kamchatka Krai's administrative center, Petropavlovsk-Kamchatsky. Together with neighbouring Avachinsky, it is considered a Decade Volcano, worthy of particular study in light of its history of explosive eruptions and proximity to populated areas.

The Bering Sea (/ˈbɛərɪŋ, ˈbɛrɪŋ/ BAIR-ing, BERR-ing, US also /ˈbɪərɪŋ/ BEER-ing; Russian: Бе́рингово мо́ре, romanized: Béringovo móre, IPA: [ˈbʲerʲɪnɡəvə ˈmorʲe]) is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and the Americas. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelves. The Bering Sea is named after Vitus Bering, a Danish-born Russian navigator, who, in 1728, was the first European to systematically explore it, sailing from the Pacific Ocean northward to the Arctic Ocean.

The Bering Sea is separated from the Gulf of Alaska by the Alaska Peninsula. It covers over 2,000,000 square kilometers (770,000 sq mi) and is bordered on the east and northeast by Alaska, on the west by the Russian Far East and the Kamchatka Peninsula, on the south by the Alaska Peninsula and the Aleutian Islands and on the far north by the Bering Strait, which connects the Bering Sea to the Arctic Ocean's Chukchi Sea. Bristol Bay is the portion of the Bering Sea between the Alaska Peninsula and Cape Newenham on mainland Southwest Alaska.

55°00′N 166°24′E / 55.00°N 166.40°E / 55.00; 166.40

The Commander Islands, Komandorski Islands, or Komandorskie Islands (Russian: Командо́рские острова́, Komandorskiye ostrova) are a series of islands in the Russian Far East, a part of the Aleutian Islands, located about 175 km (109 mi) east of the Kamchatka Peninsula in the Bering Sea. Treeless and sparsely populated, the islands consist of Bering Island, 95 by 15 km (59 by 9 mi); Medny Island, 55 by 5 km (34 by 3 mi); and fifteen islets and rocks. The largest of the latter are Tufted Puffin Rock (Kamen Toporkov or Ostrov Toporkov), 15 ha (37 acres), and Kamen Ariy, which are between 3 and 13 km (2 and 8 mi) west of the only settlement, Nikolskoye. Administratively, the Commanders compose the Aleutsky District of the Kamchatka Krai in Russia.

Karaginsky Island or Karaginskiy Island (Russian: Карагинский остров) is an island in the Karaginsky Gulf of the Bering Sea. The 40-kilometre (25 mi)-wide strait between the Kamchatka Peninsula and this island is called Litke Strait. Karaginsky Island is a Ramsar site. Even though the island is uninhabited, the Karagin Koryaks have traditionally lived in Karaginskiy Island. Migrant reindeer herders still live in temporary shelters on the island.

The island is 101 km (63 mi) long and up to 27 km (17 mi) wide, with an area of 193,597 ha (1,935.97 km; 747.48 sq mi). The highest peak of the island is 912 m (2,992 ft). Karaginsky Island is covered with tundra vegetation and cedar underwood. In the summer, there are many flowers.

Koryaks (Russian: коряки) are an Indigenous people of the Russian Far East who live immediately north of the Kamchatka Peninsula in Kamchatka Krai and inhabit the coastlands of the Bering Sea. The cultural borders of the Koryaks include Tigilsk in the south and the Anadyr basin in the north.

The Koryaks are culturally similar to the Chukchis of extreme northeast Siberia. The Koryak language and Alutor (which is often regarded as a dialect of Koryak), are linguistically close to the Chukchi language. All of these languages are members of the Chukotko-Kamchatkan language family. They are more distantly related to the Itelmens on the Kamchatka Peninsula. All of these peoples and other, unrelated minorities in and around Kamchatka are known collectively as Kamchadals.

The volcanoes of Kamchatka are a large group of volcanoes situated on the Kamchatka Peninsula, in eastern Russia. The Kamchatka River and the surrounding central side valley are flanked by large volcanic belts containing around 160 volcanoes, 29 of them still active. The peninsula has a high density of volcanoes and associated volcanic phenomena, with 29 active volcanoes being included in the six UNESCO World Heritage List sites in the Volcanoes of Kamchatka group, most of them on the Kamchatka Peninsula.

The first island chain is the first string of major Pacific archipelagos out from the East Asian continental mainland coast. It is principally composed of the Kuril Islands, the Japanese archipelago, the Ryukyu Islands, Taiwan (Formosa), the northern Philippines, and Borneo, hence extending all the way from the Kamchatka Peninsula in the northeast to the Malay Peninsula in the southwest. The first island chain forms one of three island chain doctrines within the island chain strategy in the U.S. foreign policy. It is considered a strategic military barrier to accessing the wider Pacific Ocean given the relative shallowness of waters to the west of the first island chain, which has important implications for submarine detection.

Much of the first island chain is roughly situated in waters claimed by the People's Republic of China (PRC). These include the South China Sea, within the disputed nine-dash line, as well as the East China Sea west of the Okinawa Trough.

Yu Shan or Yushan, Tongku Saveq, Mount Niitaka (during Japanese rule), and Mount Morrison before Japanese rule, is the highest mountain in Taiwan at 3,952 m (12,966 ft) above sea level, giving Taiwan the 4th-highest maximum elevation of any island in the world. It is the highest point in the western Pacific region outside of the Kamchatka Peninsula. Yushan and its surrounding mountains belong to the Yushan Range. The area was once in the ocean; it rose to its current height because of the Eurasian Plate's movement over the Philippine Sea Plate. Yushan is ranked 40th by topographic isolation.

The mountains are now protected as the Yushan National Park. The national park is Taiwan's largest, highest, and least accessible national park. It contains the largest tract of wilderness remaining on the island.