Silhouette Island is located 20 kilometers northwest of Mahé in the Seychelles. It is Seychelles’ third largest granitic island. It covers an area of 20.1 km2 and has a population of 200 people, the majority of whom are island workers. The main settlement is La Passe, where the Hilton Hotel is located. Silhouette Island is home to many endemic and threatened plant and animal species, making it one of the greatest biodiversity hotspots in the western Indian Ocean. The Critically Endangered Seychelles sheath-tailed bat is one of the most important. Silhouette National Park was established in 2010, safeguarding 93 percent of the landmass. The island is also an Important Bird Area, and the Alliance for Zero Extinction considers it to be a critical place for the conservation of critically endangered species.