Chukchi Sea is a marginal sea

Marginal sea

The term marginal sea has differing meanings. In one sense the term is equivalent to territorial waters. In another sense the term indicates a partially enclosed sea adjacent to or widely open to the open ocean, but bounded by submarine ridges...

 of the Arctic Ocean

Arctic Ocean

The Arctic Ocean, located in the Northern Hemisphere and mostly in the Arctic north polar region, is the smallest and shallowest of the world's five major oceanic divisions...

. It is bounded on the west by the De Long Strait

De Long Strait

The De Long Strait separates Wrangel Island from the Siberian mainland. It is very broad, its minimum width being 141 km, between Cape Blossom at the southwestern tip of Wrangel Island and Cape Billings, close to Gytkhelen, Chukotka.Technically, more than a strait in the proper sense of the...

, off Wrangel Island

Wrangel Island

Wrangel Island is an island in the Arctic Ocean, between the Chukchi Sea and East Siberian Sea. Wrangel Island lies astride the 180° meridian. The International Date Line is displaced eastwards at this latitude to avoid the island as well as the Chukchi Peninsula on the Russian mainland...

, and in the east by Point Barrow

Point Barrow

Point Barrow or Nuvuk is a headland on the Arctic coast in the U.S. state of Alaska, northeast of Barrow. It is the northernmost point of all the territory of the United States, at...

, Alaska

Alaska

Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

, beyond which lies the Beaufort Sea

Beaufort Sea

The Beaufort Sea is a marginal sea of the Arctic Ocean, located north of the Northwest Territories, the Yukon, and Alaska, west of Canada's Arctic islands. The sea is named after hydrographer Sir Francis Beaufort...

. The Bering Strait

Bering Strait

The Bering Strait , known to natives as Imakpik, is a sea strait between Cape Dezhnev, Chukotka Autonomous Okrug, Russia, the easternmost point of the Asian continent and Cape Prince of Wales, Alaska, USA, the westernmost point of the North American continent, with latitude of about 65°40'N,...

 forms its southernmost limit and connects it to the Bering Sea

Bering Sea

The Bering Sea is a marginal sea of the Pacific Ocean. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelves....

 and the Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. The principal port on the Chukchi Sea is Uelen

Uelen

Uelen is a rural locality in the Chukotsky District, just south of the Arctic Circle in Chukotka Autonomous Okrug in the Russian Far East. Population: 776 in 2003, with 595 Chukchi and 72 Yupik. Located near Cape Dezhnev where the Bering Sea meets the Chukchi Sea, it is the easternmost settlement...

 in Russia. The International Date Line

International Date Line

The International Date Line is a generally north-south imaginary line on the surface of the Earth, passing through the middle of the Pacific Ocean, that designates the place where each calendar day begins...

 crosses the Chukchi Sea from NW to SE. It is displaced eastwards to avoid Wrangel Island

Wrangel Island

Wrangel Island is an island in the Arctic Ocean, between the Chukchi Sea and East Siberian Sea. Wrangel Island lies astride the 180° meridian. The International Date Line is displaced eastwards at this latitude to avoid the island as well as the Chukchi Peninsula on the Russian mainland...

 as well as the Chukotka Autonomous Okrug

Chukotka Autonomous Okrug

Chukotka Autonomous Okrug , or Chukotka , is a federal subject of Russia located in the Russian Far East.Chukotka has a population of 53,824 according to the 2002 Census, and a surface area of . The principal town and the administrative center is Anadyr...

 on the Russian mainland.
The sea has an approximate area of 595,000 km² (230,000 mi²) and is only navigable about four months of the year.