It was discovered by the French Antarctic Expedition, 1908–10, under Jean-Baptiste Charcot.

The island was charted by the British Graham Land Expedition under John Rymill in February 1936 and was so named because with the island on its west side it forms a lagoon.

[1] This article incorporates public domain material from "Lagoon Island".

Geographic Names Information System.

This Adelaide Island location article is a stub.