Kanchanaburi city, the capital of Kanchanaburi Province, is a popular resort town; picturesque and worthy of a visit in it's own right, it is frequently visited as base of operations for exploring the many cultural, natural, and historical attractions in the surrounding countryside. Located at the confluence of the Kwai Noi and Kwai Yai Rivers, Kanchanaburi lies at the source of the Mae Klong River, and these majestic bodies of water are defining characteristics of the town. The original town of Kanchanaburi was established by King Rama I as a first line of defense against the Burmese, whom he believed might use the old invasion route through the Three Pagodas Pass at the Siam-Myanmar border.