High Quality Content by WIKIPEDIA articles! Pasir Mas is a town and territory (jajahan) in Kelantan, Malaysia.The district of Pasir Mas covers an area of 577 square kilometers and is bordered by the districts of Tumpat to the north, Tanah Merah to the south, Kota Bahru to the east, and the Thai district of Su-ngai Kolok (Malay: Sungai Golok) to the west. Due to its geographical location, it acts as the main gateway of the East Coast of Malaysia to Thailand and is also traversed by major road transport routes from the West Coast to the state capital of Kota Bahru. The main town of the same name was once the second biggest in the state until the early 1990s when it was overtaken by Tanah Merah. The town is blocked from expanding to the south by the Kelantan River.