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 Haloban.

As a consequence of the 2005 Nias–Simeulue earthquake, the island dropped rendering the coastal residences useless and damaging the port.[citation needed]

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2°14′N 97°14′E / 2.233°N 97.233°E / 2.233; 97.233