Route 1090 from Mae Sot to Umphang is one of Southeast Asia's legendary rides: 165km and a counted 1,219 curves along the Thai-Myanmar border ridge, through jungle and Karen hill country. The road earned its grim name during its violent 1970s construction. The payoff is Thi Lo Su, Thailand's largest waterfall — 250m high and 450m wide — reached by a rough dirt track from Umphang. Best ridden November–February when the dirt is dry and the air is cool.
Clone it to your planner, customize dates and stops, then ride. All free.