Pengkalan Hulu history began when it was the administrative centre for Negeri Reman (part of Negeri Patani) where it bordered with Kedah and Patani. In 1902, Siam abolished the monarchy system in Negeri Reman. Kroh was an isolated small town with a unique location where it bordered with Thailand at the north, and with Kedah at the west. Its nearest neighbours are Baling, Kedah; Betong, Thailand with a distance of 15 km, and Gerik, Perak with a distance of 30 km.