Singapore, officially the Republic of Singapore, is a sovereign city-state and island country located within the Malay archipelago of maritime Southeast Asia. Singapore lies about one degree north of the equator, and is situated off the southern tip of the Malay Peninsula, and, by extension, the southernmost extremity of continental Eurasia. The island country shares its southern maritime border with Indonesia's Riau Islands, its northern, western, and eastern maritime borders with the Johor state of Peninsular Malaysia, and is in the vicinity of Sumatra to its west and Borneo to its east. It is enveloped by the littoral waters of the Johore Strait to its north and the Singapore Strait to its south, and is geographically positioned within the confluence of the Indian and Pacific Oceans, being bounded by the Malacca Strait to its west and the South China Sea to its east. The country's territory is composed of one main island, 63 satellite islands and islets, and one outlying islet, the combined area of which has increased by almost 25% since the country's independence as a result of extensive land reclamation projects.