Lumbis Subdistrict lies at hinterland of Sembakung River, with the capital Atap. It is about 215 Km from tarakan to Atap. The Northern part of this area is contingous with East Sabah/Malaysia, the citizens are mostly of Tagel Tribe, Tenggalan Tribe, and Berusu Tribe. They live traditional life as farmers.
We can go to this place by river boat (Tarakan-Atap/Mensalong).
