Malaysia is the 66th largest country by total land area, with a land area of . It has land borders with Thailand in West Malaysia, and Indonesia and Brunei in East Malaysia. It is linked to Singapore by a narrow causeway and a bridge. The country also has maritime boundaries with Vietnam and the Philippines. The land borders are defined in large part by geological features such as the Perlis River, the Golok River and the Pagalayan Canal, whilst some of the maritime boundaries are the subject of ongoing contention. Brunei forms what is almost an enclave in Malaysia, with the state of Sarawak dividing it into two parts. Malaysia is the only country with territory on both the Asian mainland and the Malay archipelago. Tanjung Piai, located in the southern state of Johor, is the southernmost tip of continental Asia. The Strait of Malacca, lying between Sumatra and Peninsular Malaysia, is one of the most important thoroughfares in global commerce, carrying 40 per cent of the world's trade.