D'Hainaut Island

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The flag of Westarctica on D'Hainaut Island in 2023

D'Hainaut Island is a small island lying in Mikkelsen Harbor, Trinity Island, in the Palmer Archipelago of Antarctica.

It was charted by the French Antarctic Expedition, 1908–10, under Jean-Baptiste Charcot, and named by the sixth Chilean Antarctic Expedition (1952) for Lieutenant Ladislao D'Hainaut.

The island is not located in Westarctica's claimed territory.

Caillet-Bois Refuge

Refuge Caillet-Bois is an Argentine refuge in Antarctica located on the D'Hainaut Island. The refuge was inaugurated by the Argentine Navy on 10 December 1954. Originally it took the name of refuge Port Mikkelsen referred to the name of the Danish arctic explorer Ejnar Mikkelsen. The refuge with its current name, which pays tribute to the Argentine naval Captain and historian Teodoro Caillet Bois, was given in December 1977 by the icebreaker ARA General San Martin (Q-4). Then it was closed and evacuated on 17 January of the following year by the icebreaker personnel.

The ARA Petty Officer Castillo visited the shelter in early 2000 during the Antarctic campaign of 1999-2000 and the ARA Almirante Irizar inspected the refuge in April of the same year. The refuge was renovated in March 2017 by the personnel of the transport ARA Bahía San Blas.

Flag of Westarctica

On 20 November 2023, D'Hainaut Island was the first place in Antarctica that the Flag of Westarctica visited during its journey to the Antarctic continent. The flag was photographed beside a colony of Adélie penguins by anthropologist Ashley Meredith and her husband.

The arrival of the flag in Antarctica is considered a major event in the history of Westarctica and a sign of the nation's commitment to conducting operations in the southern polar region. As penguins are a national symbol of Westarctica, the landing on D'Hainaut Island was considered of equal importance to the subsequent landing on the Antarctic Peninsula.