[1] Its main geographic feature is Mount Stephens, at 432 m (1417 feet),[2] on the island's southeast end at 54°07′39″N 130°40′15″W / 54.12750°N 130.67083°W / 54.12750; -130.67083 (Mount Stephens).

The island was named by Captain Vancouver in honour of Sir Philip Stephens, secretary to the Admiralty from 1763 to 1795.

[5]: 255 The Early Cretaceous Stephens Island pluton dates to the Albian era (102±8 Ma).

91 is located on the west side of the island's northern part, at 54°08′00″N 130°47′00″W / 54.13333°N 130.78333°W / 54.13333; -130.78333 (Squadaree IR No.

[14] Overlooking that from the south, at the northern tip of Stephens Island itself, is Qlawd Hill at 54°11′28″N 130°46′29″W / 54.19111°N 130.77472°W / 54.19111; -130.77472 (Qlawd Hill).