The Sankalakhiri (Thai: สันกาลาคีรี, IPA: [sǎn.kaːlaːkʰiːriː]) mountain range is the natural border between Thailand and Malaysia.
This mountain range is a part of the Tenasserim Hills system. It forms the continuation of the Nakhon Si Thammarat mountain range to the north and the Titiwangsa Mountains to the south, the mountainous backbone of the Malay peninsula.
Several national parks and other protected areas are located in the mountain range.