| Unisan Island | |
| Map: | Philippines |
| Map Relief: | yes |
| Coordinates: | 10.3339°N 122.5881°W |
| Country: | Philippines |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Western Visayas |
| Country Admin Divisions Title 1: | Province |
| Country Admin Divisions 1: | Guimaras |
| Country Admin Divisions Title 2: | Municipality |
| Country Admin Divisions 2: | Nueva Valencia |
Unisan Island is a small island located in southernmost part of Nueva Valencia, Guimaras and beside Malingin Island in the Philippines. It is the largest island in the Unisan Islets.[1]
In August 2006, the Guimaras oil spill occurred. The 988-ton M/T Solar 1, chartered by Petron (the Philippines’ largest oil refinery), was carrying 2.41 million litres of bunker fuel sank off the island's southern coast, contaminating .[2] The Philippine Coast Guard called this the worst oil spill in the country's history. According to officials, of mangroves were affected, including parts of the Taklong Island National Marine Reserve.