Singapore, officially the Republic of Singapore, is a modern city-state and island country in Southeast Asia. It lies off the southern tip of the Malay Peninsula and is 137 kilometres (85 mi) north of the equator; it is also separated from Peninsular Malaysia by the Straits of Johor to the north, and from Indonesia's Riau Islands by the Singapore Strait to the south. Singapore's territory consists of the diamond-shaped main island, commonly referred to as Singapore Island in English and Pulau Ujong in Malay, and more than 60 significantly smaller islets; also, land reclamation has been used to expand Singapore's land area, which is highly urbanised.