Trail Inlet is an ice-filled inlet which recedes southwest 15 nautical miles (28 km) between Three Slice Nunatak

Three Slice Nunatak

Three Slice Nunatak is a conspicuous nunatak rising to 500 m, surmounting the low, ice-covered northeast extremity of Joerg Peninsula on the east coast of Graham Land. This distinctive landmark, in the form of a serrated ridge 1.5 nautical miles long, is snow covered, except for the three almost...

 and Cape Freeman

Cape Freeman

Cape Freeman is a cape forming the north end of Sturge Island in the Balleny Islands. Named for H. Freeman, commander of the cutter Scott, resulting in the discovery of the Balleny Islands in 1839....

, on the east coast of Graham Land

Graham Land

Graham Land is that portion of the Antarctic Peninsula which lies north of a line joining Cape Jeremy and Cape Agassiz. This description of Graham Land is consistent with the 1964 agreement between the British Antarctic Place-names Committee and the US Advisory Committee on Antarctic Names, in...

. The inlet was sighted by Sir Hubert Wilkins on his flight of December 20, 1928. The width of Graham Land is reduced to 20 nautical miles (37 km) between the heads of Trail Inlet and Neny Fjord

Neny Fjord

Neny Fjord is a fjord which is 10 miles long in an east-west direction and 5 miles wide, between Red Rock Ridge and Roman Four Promontory on the west coast of Graham Land, Antarctica.-History:...

. So named by the US-SCAN because it was a natural route of travel for flights and sledge trips from the East Base of the United States Antarctic Service (USAS), 1939–41, to the east coast of Graham Land.