BOOTHIA (Boothia Felix), a peninsula of British North America, belonging to Franklin district, and having an area of 13,100 sq. m., between 69° 30′ and 71° 50′ N. and 91° 30′ and 97° W. Its northernmost promontory, Murchison Point, is also the northernmost point of the American mainland. It was discovered by Captain (afterwards Sir James) Ross, during his expedition of 1829–1833, and was named after Sir Felix Booth, who had been chiefly instrumental in fitting out the expedition. Boothia forms the western side of Boothia Gulf. From the main mass of the continent the peninsula is almost separated by lakes and inlets; and a narrow channel known as Bellot Strait intervenes between it and North Somerset Island, which was discovered by Sir E. Parry in 1819. The peninsula is not only interesting for its connexion with the Franklin expedition and the Franklin search, but is of scientific importance from the north magnetic pole having been first distinctly localized here by Ross, on the western side, in 70° 5′ N., 96° 47′ W.

Boothia Gulf separates the north-western portion of Baffin Land and Melville Peninsula from Boothia Peninsula. It is connected with Barrow Strait and Lancaster Sound by Prince Regent Inlet, with Franklin Strait by Bellot Strait, and with Fox Channel by Fury and Hecla Strait. The principal bays are Committee and Pelly in the southern portion, and Lord Mayor in the western.