Malaysia is bordered by several countries both by land and water. The countries that border Malaysia are:

• Land Borders: Malaysia shares a land border with three countries: Thailand, Indonesia, and Brunei. The Malaysian states of Sabah and Sarawak lie to the north of the border with Indonesia, while the Thai provinces of Narathiwat, Satun, Songkhla, and Yala border the Malaysian states of Kedah, Kelantan, Perak, and Perlis. The length of the border with Indonesia is 2,019.5 km, and the border with Thailand is 646.5 km long.

• Maritime Borders: Malaysia has common maritime boundaries with six countries: Brunei, Indonesia, the Philippines, Singapore, Thailand, and Vietnam. Part of its maritime borders have been delimited through agreements with neighboring countries. Malaysia has agreements to delimit the continental shelf, territorial sea, and other border delimitation agreements or treaties with Indonesia, the Philippines, Thailand, and Singapore. However, only a portion of the border is delimited through agreements, and the bulk of the border is the result of the unilateral declaration by Malaysia through its 1979 map and is subject to dispute, including most of the border with the Philippines.

In summary, the countries that border Malaysia are Thailand, Indonesia, Brunei, the Philippines, Singapore, and Vietnam.