According to Sukhothai inscriptions, the city wasrectangular in shape — 1.3km wide and 1.8km long.Outstanding innovations of Sukhothai were theirrigation system, including Sa Reed Phong Dam, oran earthen dyke, barai, or ponds numbering 80, andwater pipes. Named after a Sanskrit word meaningdam or dyke, Sa Reed Phong is about 3km away on the southwest side of the city.