Sentosa Island, commonly referred to as Sentosa, is an island located off the southern coast of Singapore's main island. It is situated across a channel of water known as Keppel Harbour and sits adjacent to Pulau Brani, which is positioned between Sentosa and the mainland.
The island serves as a distinct geographical entity separated from the primary landmass of Singapore by these surrounding waters. While it is part of the region's coastal geography, its specific location is defined by its proximity to both Keppel Harbour and Pulau Brani.