evidence: Singapore is a sovereign state located in Southeast Asia and is officially known as the Republic of Singapore. It lies in the southern tip of Malay Peninsula, 137 kilometres north of the equator. [...] Its major territory is a diamond-shaped island although it includes smaller islands within its area of responsibility. Singapore is almost more than 3.5 times the size of Washington, D.C. Its highest point is Bukit Timah with a height of about 165 meters, made up of igneous rock and granite. The valleys and hills of sedimentary rocks cover the northwest while sandy and flatter land dominate the eastern region.