 To the north is Than To, to the east is Chanae, (Narathiwat Province).To the south is the Malaysian state of Perak and to the west is Kedah.The highest point of the Sankalakhiri Range (Northern Titiwangsa Mountains), high Ulu Titi Basah (เขาหลวง), is on the Thai–Malaysian border between Betong District and Hulu Perak District of Perak.