S of Naknek Lake, on Alaska Peninsula, in Katmai National Monument, 35 mi. NW of Mount Katmai, Aleutian Range. 11 miles long.
Named in 1919 by R. F. Griggs of the National Geographic Society for Alfred Hulse Brooks. The Eskimo name was Ketivik, to which R. H. Sargent, U.S. Geological Survey (USGS), in 1923, gives the long meaning "beavers broke their houses a long time ago." See Brooks Range.