Southern Thailand
Southern Thailand is a distinct region of Thailand, connected with the central region by the narrow Kra Isthmus.
Geography
Southern Thailand is on the Malay Peninsula, with an area around 70,713 km², bounded to the north by Kra Isthmus, the narrowest part of the peninsula. The western part has steeper coasts, while on the east side river plains dominate. The largest river of the south is the Tapi in Surat Thani, which together with the Phum Duang in Surat Thani drains more than 8,000 km², more than 10% of the total area of Southern Thailand. Smaller rivers include the Pattani, Saiburi, Krabi, and the Trang. The biggest lake of the south is Songkhla Lake (1,040 km² altogether). The largest artificial lake is the Chiao Lan (Ratchaprapha Dam), occupying 165 km² of Khao Sok National Park in Surat Thani.
Surat Thani
Running through the middle of the peninsula are several mountain chains, with the highest elevation at Khao Luang, 1,835 m, in Nakhon Si Thammarat Province. Ranging from the Kra Isthmus to Phuket island is the Phuket chain, which connects to the Tanao Si Mountain Range further north. Almost parallel to the Phuket chain, but 100 km to the east is the Nakhon Si Thammarat or Banthat chain, which begins with Samui island, Ko Pha Ngan, and Ko Tao in Surat Thani and ends at the Malaysian border at the Ko Ta Ru Tao archipelago. The border with Malaysia is formed by the Sankalakhiri range, sometimes subdivided into the Pattani, Taluban, and Songkhla chain. At the Malaysian border the Titiwangsa chain rises up.