The Banyak Islands (sometimes spelled Banjak Islands) are a group of sparsely inhabited islands located between Simeulue and Nias off the western coast of Sumatra in Indonesia's Aceh Province, consisting of 99 small land masses. The largest island in the group is Tuangku (Great Banyak), with the principal town of Alaban. Two other major islands located either side of Tuangku are Bangkaru and Ujung Batu. Tuangku is separated from Bangkaru by a fault line.