Location: Cape Sidmouth and north nearly to Night Island. South to vicinity of Chester River. They were closely linked with the Kawadji of Night Island and vicinity.
Co-ordinates: 143°30'E x 13°30'S
Area: 300 sq. m. (800 sq. km.)
References: Parry-Okeden, 1897; Hale and Tindale, 1933; Thomson, 1933, 1934, 1946, 1952, 1955; McConnel, 1939-1940; Sharp, 1939; Tindale, 1940; Capell, 1956, 1963.
Alternative Names: Ompeila, Ompela, Umpila, Umpilo, Umbila, Oombilla, Koko-umpilo.