Jonassen Island

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Jonassen Island is one of several Antarctic islands around the peninsula known as Graham Land, which is closer to South America than any other part of that continent.^[1]

It is said to be a particularly rocky island, 2.5 miles long. It is located north of Andersson Island/

It was first named Irizar Island by Otto Nordenskiöld in honor of the Argentine captain whose ship rescued the Swedish Antarctic expedition in 1903. A year later, another island elsewhere in the Antarctic was named Irizar and, because that was a larger island and the name was in broad use for the location, the smaller island was renamed for Ole Jonassen, who accompanied Nordenskiöld on his two major sledge journeys in 1902-3.^[2]

The main life form on the island are gentoo penguins and kelp gulls. Both species have established breeding colonies on the island. Adélie and chinstrap penguins as well as pintado and snow petrels have been observed around or flying about the island. A 1901 observation listed the Adélie has having nested on the island; the claim has not been substantiated in modern surveys.^[3]

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