He made a sea voyage to the Sandwich Islands for his health, and after his return he graduated from the medical department of Yale in 1844.
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Vagrants have been observed in South Georgia, South Orkney and the South Shetland Islands.
The Chinstrap Penguin (Pygoscelis antarctica) is a species of penguin which is found in the South Sandwich Islands, Antarctica, Deception Island, the South Orkneys, South Shetland,South Georgia, Bouvet Island and Balleny.
The Swedish Antarctic Expedition (1901–1904) named a glacier on South Georgia Island in the southern Atlantic Ocean after De Geer.
South Georgia Shag, Phalacrocorax (atriceps) georgianus, from the South Georgia and the South Sandwich Islands, and South Orkney Islands.
The Antarctic sea urchin is found in circumpolar waters including the Southern Ocean, the Balleny Islands, South Georgia and the South Sandwich Islands, Terra Nova Bay and Victoria Land.