Siasi is an island in the Philippines under the jurisdiction of Siasi in the province of Sulu. The island lies within the Celebes Sea.

Siasi has an approximate area of 77.83 square kilometers or 30.05 square miles, and roughly has a coastline length of 35.13 kilometers or 21.83 miles. The island is situated at approximately 5.5403, 120.8616. Elevation at these coordinates is estimated at 179 meters or 587.27 feet above mean sea level.


  1. Land area figures and coastline length were calculated from OpenStreetMap data.
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