90% of the whole area of Chiangrai comprises high mountains.   Some are as high as 1,500 meters above sea level, especially those along the Phi-Pan-Nam Mountain Rang which come down from Daen-Lao Mountain in Chiangmai, stretching to meet Luang Prabang Mountain from Nan Province. Mt.Langka is the its highest peak at the height of 2,030 meters.  Chiangrai, therefore, can boast of being the "motherland" of several important rivers that are the lifelines of the north.  These include Kok, Ing, Lao, and Sai Rivers.  Of these Kok River is the most important because its runs through the city of Chiangrai.  Thus, you may hear... Kok Rafting.. in Chiangrai via Thaton, a district bordering between Chiangrai and Chiangmai. Staying at least a night during rafting.. accommoation is also available by the starting point...click Thaton Chale