Onekotan

Onekotan (Template:Langx; Japanese 温禰古丹島; Onekotan-tō, occasionally Onnekotan-tō, Template:Langx) is an uninhabited volcanic island located near the northern end of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean. Its name is derived from the Ainu language for "large village”. It is the second largest island, after Paramushir, in the northern subgroup of the Kurils. It is administratively included in the Severo-Kurilsky District of Sakhalin oblast, Russia.

Geography and geology

Onekotan is roughly rectangular, with a length of Template:Convert, and a width ranging from Template:Convert. It has an area of Template:Convert

File:Onekotan.png

Topographic map of the Onekotan group

The island consists of two stratovolcanos connected by a relatively flat isthmus.

• Krenitsyn -(Template:Langx; Japanese 黒石山; Kuroishiyama) with a height of Template:Convert is the prominent caldera at the southern end of the island. This volcano was named after Captain Pyotr Krenitsyn of the Imperial Russian Navy. The mountain rises from a depth of from Template:Convert, and contains a deep (Template:Convert) central caldera lake (Koltsevoe Lake) with a diameter of Template:Convert, called Tao-Rusyr Caldera. The central peak of this "island within the island" is actually the highest point on Onekotan Island.
• Nemo -(Template:Langx; Japanese 根茂山; Nemoyama) with a height of Template:Convert is the peak to the north. It has two nested subsidiary calderas, with the cone of Nemo Peak rising in the southwest end of the youngest caldera and a crescent-shaped crater lake, named Lake Chernoye, partially filling the northeast part.

The contemporary structure of the caldera basin of Koltsevoe Lake was examined by Kozlov et al. through sonar survey utilizing a digital sonar and satellite positioning. The survey yielded 27 sonar profiles and a compiled bathymetric map. Presently, the lake holds the fourth position among Russia's deepest lakes, standing as the deepest in the Russian Far East and the largest in the Sakhalin region. Its significant water volume underscores its importance as a vital hydrological asset in the Far Eastern macro-region.

File:Onekotan Island Map.png

Topographic map of Onekotan Island

There are seven rivers on the island more than five kilometers long. The largest is Ozernaya River (Template:Convert long, which flows from the southern part of the caldera of the Nemo volcano to the Sea of Okhotsk. Almost the same length is the Kedrovka River, which flows from the central part of the island into the Pacific Ocean.

The climate of Onekotan is characterized by short, cool summers, high humidity, frequent fogs, and especially strong winds. However, the island's climate is generally considered to be mild oceanic with an average annual temperature of about Template:Convert. Even in record cold winters, temperatures below Template:Convert were not observed.

Onekotan is separated from the neighboring islands by the Fourth Kuril Strait, Yevreinov Strait, and Krenitsyn Strait. The neighboring islands are Makanrushi, with a Template:Convert volcanic peak, is Template:Convert to the northwest of Onekotan; and Kharimkotan, with a Template:Convert high volcano, is Template:Convert to the southwest. Paramushir is located Template:Convert to the northeast.

Onekotan still has an active volcano with the most recent eruption, in 1952, forming a small lava dome on the coast of Krenitsyn island within the lake of Tao-Rusyr Caldera. A bay on the eastern shore contains the remains of an abandoned settlement.

• Snow cover highlights the calderas and volcanic cones that form the northern and southern ends of Onekotan.
  Snow cover highlights the calderas and volcanic cones that form the northern and southern ends of Onekotan.
• View of Krenitsyn Peak from the rim of Tao-Rusyr Caldera on Onekotan Island
  View of Krenitsyn Peak from the rim of Tao-Rusyr Caldera on Onekotan Island

History

Onekotan, with a number of shallow bays and sandy beaching providing landing points, was inhabited by the Ainu prior to European contact. It appears on an official map showing the territories of Matsumae Domain, a feudal domain of Edo period Japan dated 1644, and these holdings were officially confirmed by the Tokugawa shogunate in 1715.

The island was surveyed by Russian geodesists and explorers Ivan Yevreinov and Fyodor Luzhin in 1720, and was subsequently, claimed by the Empire of Russia in 1736 after the Ainu inhabitants were converted to the Russian Orthodox Church; however Russian tax collectors encountered Japanese officials on the islands in 1744–45.

Sovereignty initially passed to Russia under the terms of the 1855 Treaty of Shimoda, but was returned to the Empire of Japan per the Treaty of Saint Petersburg in 1875 along with the rest of the Kuril islands. The island was formerly administered as part of Shimushu District of Nemuro Subprefecture of Hokkaidō. In 1884, the Ainu inhabitants were relocated by Japanese authorities to Shikotan.

During World War II, the island had a small Japanese garrison, which surrendered on August 25, 1945, without a fight.

After 1945, the island came under the control of the Soviet Union, and is now administered as part of the Sakhalin Oblast of the Russian Federation. A small garrison on the island was withdrawn in 2005.

Flora and fauna

There are chars in Lake Chyornoye, one of the two lakes on Onekotan, located at the northern end of the island.

In the spring and summer pigeon guillemot and Leach's storm petrel nest on the island.

Mammals found on the island include foxes and small rodents, with seals and sea lions on the coast.

The strong winds and harsh climate limit the growth of trees to small thickets of Krummholz formations of Siberian dwarf pine with a maximum height of 2–4 meters, mostly in gullies.

See also

• List of volcanoes in Russia
• List of islands of Russia
• List of islands
• Desert island

Further reading

• Gorshkov, G. S. Volcanism and the Upper Mantle Investigations in the Kurile Island Arc. Monographs in geoscience. New York: Plenum Press, 1970. Template:ISBN
• Krasheninnikov, Stepan Petrovich, and James Greive. The History of Kamtschatka and the Kurilski Islands, with the Countries Adjacent. Chicago: Quadrangle Books, 1963.
• Takahashi, Hideki, and Masahiro Ōhara. Biodiversity and Biogeography of the Kuril Islands and Sakhalin. Bulletin of the Hokkaido University Museum, no. 2-. Sapporo, Japan: Hokkaido University Museum, 2004.

External links

• NASA Earth from Space: Onekotan Island
• Photographs of Onekotan Island
• Template:Usurped