Malaysia, constitutional monarchy in Southeast Asia on the South China Sea. Malaysia is divided into two regions, known as West Malaysia and East Malaysia. West Malaysia, also known as Peninsular Malaysia, consists of the southern portion of the Malay Peninsula and nearby islands. Thailand borders West Malaysia on the north, and Singapore lies off the southern coastal tip. East Malaysia occupies the northern section of Borneo Island, as well as offshore islands. East Malaysia shares Borneo with Brunei, which lies on a small section of the northern coast, and with the Kalimantan region of Indonesia, which lies to the south. Malaysia is a federation of 13 states and 3 federal territories. The city of Kuala Lumpur, coextensive with the federal territory of the same name, is the capital and largest city. Located near Kuala Lumpur is the administrative center of the federal government, Putrajaya, which also makes up a federal territory.