The Sai Yok Waterfall This waterfall has always been important to the Thai people. Visiting Kanchanaburi without seeing these falls is like visiting Bangkok and not stopping in the Grand Palace. Lacation This limestone waterfall is in the Sai Yok National Park, which straddles Amphoe Thong Pha Phum and Amphoe Sai Yok in the Kanchanaburi province. Not only does this National Park have beautiful scenery, Not only does this National Park have beautiful scenery, but also boasts waterfalls to see, caves to be spelunked, and water to be canoed or kayaked on. The National Park Office is located in Amphoe Sai Yok.