Mae Ya Waterfall Ban Luang Chiang Mai Thailand/Mae Ya Waterfall, or Nam Tok Mae Ya, is one of the largest and most beautiful waterfalls in Chiang Mai. The fresh water splashes down over 30 tiers of rocks and boulders into small clear pools. Mae Ya Waterfall is a beautiful, fanning cascade, dropping down an ever-widening series of steps. The water tumbles down a 100 m cliff in a series of spectacular leaps and National Park officials estimate that the Mae Ya River plunges more than 250 m at this point. The main falls is about 40 meters high.