Sai Yok National Park, National park in Kanchanaburi Province, Thailand
Sai Yok National Park is a protected area in Kanchanaburi Province that covers roughly 500 square kilometers with mountains, waterfalls, limestone caves, and the Khwae Noi River running through it. The landscape forms part of the Western Forest Complex, one of Thailand's most important woodland regions.
During World War II, the area served as a key site for Japanese occupation forces building the Burma Railway, leaving behind military structures and camps. The forests were later restored through replanting efforts in the 1950s after the woodland had been extensively cleared for wartime needs.
The teak forests of Sai Yok underwent replantation in 1954, following extensive logging during the Japanese occupation for railway construction requirements.
The park is open daily and the best time to visit is the cooler season from November to February when hiking through the hills is more comfortable. Main attractions like waterfalls and caves are reached via marked trails, and park staff can guide you to the key areas.
The most notable cave, Tham Lawa, extends deep underground with five large chambers showcasing natural limestone formations that took thousands of years to develop. Visitors can walk through these chambers and see the different layers of stone that form the cave system.
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