Ulu Titi BasahUlu Titi Basah is the southernmost high peak of Thailand. The peak is tall and is located on the Malaysia–Thailand border between Betong District of Yala province and Hulu Perak in the state of Perak.GeographyUlu Titi Basah is the highest summit of the Sankalakhiri Range, the northern section of the Titiwangsa Mountains, a sub-range of the Tenasserim Hills.