Singapore, officially the Republic of Singapore, is a sovereign 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. Made up of the lozenge-shaped main island (widely known as Singapore Island but also as Pulau Ujong, its native Malay name) and over 60 much smaller islets, it is separated from Peninsular Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the Singapore Strait to its south. The country is highly urbanised, with very little primary rainforest remaining. Its territory has consistently expanded through land reclamation.