Tarakan Island
The traditional territories of the Tidung people are at the Sembakung River, North Kalimantan and Sibuku River of their headwaters to the estuary north of Tarakan Island, Indonesia thence along the coast; south to the river-mouth of Bolongan River and northward up to Tawau, Sabah, Malaysia including Cowie Harbour. An enclave of Tidung people located at Labuk River, opposite the city of Klagan.