Tuangku (also known as Great Banyak) is the main and largest island in the Banyak Islands group in Indonesia. The largest town on the island is Alaban.
Map of Tuangku, Indonesia
As a consequence of the 2005 Nias–Simeulue earthquake, the island dropped rendering the coastal residences useless and damaging the port.
References
Tuangku Wikipedia(Text) CC BY-SA