[1] The Debenham Islands are in Marguerite Bay in Graham Land on the Fallières Coast of the Antarctic Peninsula.

They are south of Cape Calmette, north of Millerand Island and west of the mouth of Northeast Glacier.

[3] The Debenham Islands were discovered and named by the British Graham Land Expedition (BGLE) (1934–37) under John Rymill.

The BGLE base was on Barry Island, in the center of the group, during part of this time.

Named by the UK Antarctic Place-Names Committee (UK-APC) for Lieutenant John M. Powell, RN, who surveyed the channel in 1972.

[9] This article incorporates public domain material from websites or documents of the United States Geological Survey.