You may be thinking of the Weddell Sea. Coats land forms the eastern boundary of the Weddell.
The deep bay bounded by the Antarctic Peninsula and Coats Land is called Marguerite Bay. It is located along the western side of the Antarctic Peninsula and is known for its significant ice shelves and glaciers.
Weddell Sea
Coats Land forms the eastern shore of the Weddell Sea.
Weddell Sea
You may be thinking of the Weddell Sea.
The Weddell Sea is located in Antarctica, which is the southernmost continent on Earth. It is surrounded by the Antarctic Peninsula, Coats Land, and the eastern shore of the Antarctic Peninsula.
The Antarctic Peninsula is a length of land -- as is all other peninsula on earth -- surrounded on three sides by water. Yes, there are mountains on the Antarctic Peninsula.
All land south of 60 degrees S is governed by the Antarctic Treaty. This includes the Antarctic Peninsula.
The land you describe is called the Antarctic Peninsula.
The Trans-antarctic Mountain Ranges
The Antarctic Peninsula is the major land form on Antarctica.
It is called the Antarctic Peninsula and reaches out towards the southern tip of South America. The Antarctic Peninsula is where many of the Scientific Stations are concentrated.