Taking a cruise tour on rivers in Thailand to discover this amazing country is interesting Mekong River divides Laos and Thailand. Before passing through Laos, Mekong River in Thailand continues to wind its way right through the Northern part of the country before reaching Cambodia where it receives the Sap River. The Mekong River in Thailand is one of the most biologically diverse environments in the world and is home to numerous species of flora, fauna and animals endemic to the Mekong River Basin. Several other great rivers of Thailand join Mekong river which include the Ing River, Ruak River and Mun River The Mekong River in Thailand is home to several of the largest freshwater fish species in the world which include the mythical Mekong Catfish, Chaophraya Catfish (Dog eating Catfish) and Giant freshwater stingray