Morgan Inlet is an ice-filled inlet about 18 nautical miles (33 km) long, with two branches, indenting the east end of Thurston Island

Thurston Island

Thurston Island is an ice-covered, glacially dissected island, long, wide and in area, lying a short way off the NW end of Ellsworth Land, Antarctica. It is the third largest island of Antarctica, after Alexander Island and Berkner Island...

 between Lofgren and Tierney Peninsulas. Discovered in helicopter flights from USS Bellingshausen Sea Expedition in February 1960. Named by Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for Lieutenant Commander Joseph R. Morgan, U.S. Navy, hydrographic and oceanographic officer of U.S. Navy Task Force 43 during this expedition.