avoid confusion with nearby Nansen Island, so named in 1898 by a Belgian expedition. Bonaparte Point () was charted and named for Prince Roland Bonaparte, then President of the Paris Geographical Society. Logistics support for this expedition was provided by the Argentine Navy (Armada de la República Argentina), employing the legendary corvette ARA Uruguay. Fourth Within a year of returning from the Third Expedition, Charcot commanded a new expedition from 1908 to 1911. Sailing on the ship Pourquoi-Pas? IV (Why Not? IV), the expedition explored the Bellingshausen Sea, the Amundsen Sea, and discovered, charted and named several features. Loubet Land was named for Émile Loubet, the President of France during Charcot's earlier expedition. Charcot Island was named for the Captain himself. The expedition moored aboard ship in a cove on the southeast side of Petermann Island, which they named Port Circumcision because it was spotted 1 January 1909, the traditional day for the Feast of the Circumcision. Renaud Island was first charted and named. Fallieres Coast was first explored in January 1909, and Charcot named for Clément Armand Fallières, then President of France. Mikkelsen Bay was first seen from a distance in 1909, but it was not recognised as a bay. The Mikkelsen Islands were named after Otto Mikkelsen, a Norwegian diver who inspected the damaged hull of the Pourquoi-Pas at Deception Island. Marguerite Bay was discovered in 1909 and Charcot named the bay after his wife. Jenny Island, in Marguerite Bay, was discovered and named by Charcot for the wife of Sub-Lieutenant Maurice Bongrain, second officer of the expedition. The name "Pavie" was given in 1909 to an island, or possible cape, shown on the expedition's maps at . Viewed from a position some 15 to 17 miles southeast of Jenny Island, expedition surveyor Maurice Bongrain made sketches of this feature which were labeled both "Île Pavie" and "Cap Pavie". The area later became known as Pavie Ridge. Adelaide Island was first surveyed by the expedition. They also discovered Millerand Island, which was likely named for Alexandre Millerand, French statesman. Douglas Range was seen from a distance. Rothschild Island was named after Baron Edouard Alphonse de Rothschild (1868–1949), head of the French branch of the Rothschild family and president of the Rothschild Brothers bank. The northern portion of Wilkins Sound was first seen and roughly mapped in 1910 by the expedition. Fifth This expedition was led by Michel Barre