River Kwai Also called Sawat River The major rivers of western Canada. Extending the Thanon Thong Chai Range. Flowing south through the Umphang district, Tak province, Thung Yai Naresuan. Uthai Thani Province To the Si Sawat And Mueang Kanchanaburi Confluent with the river at Pak Khlong Muang Kanchanaburi. The Mae Klong River There are approximately 450 kilometers of the river with the famous River Kwai Bridge.