Sumbawa is an Indonesian island, located in the middle of the Lesser Sunda Islands chain, with Lombok to the west, Flores to the east, and Sumba further to the southeast. It is in the province of West Nusa Tenggara.
Sumbawa is 15,448 km2 or 5,965 sq mi (three times the size of Lombok) with a current population of around 1.33 million. It marks the boundary between the islands to the west, which were influenced by religion and culture spreading from India, and the region to the east that was not so influenced. In particular this applies to both Hinduism and Islam.