The world's largest sea is the Bering Sea.

 The world's largest sea is the Bering Sea. It is 876,000 square miles (2,270,000 sq. km).

The Bering Sea is a body of water located in the far northwest of the Pacific Ocean. It is bordered by the state of Alaska in the United States to the east, and the Russian Far East to the west. The Bering Sea is named after the Danish navigator Vitus Bering, who explored the area in the early 18th century.

The Bering Sea is known for its cold, rough waters and its rich marine life. It is home to a variety of fish, including pollock, cod, and halibut, as well as seals, whales, and sea otters. The Bering Sea is also an important habitat for migratory birds, such as the Pacific golden-plover and the Arctic tern.

The Bering Sea is a critical resource for the people who live in the region, providing food, transportation, and economic opportunities. It is also a major shipping route, connecting Asia to North America through the Bering Strait.

Despite its importance, the Bering Sea is facing a number of environmental challenges. Pollution, overfishing, and climate change are all threatening the health of the sea and the animals that depend on it. Efforts are being made to protect and preserve the Bering Sea, including the creation of marine protected areas and the implementation of sustainable fishing practices.

Overall, the Bering Sea is a unique and vital part of the world's oceans, with a rich history and a diverse array of marine life. It is important that we work to protect and preserve this valuable resource for future generations.