Mae Sai is the northernmost district (amphoe) of Chiang Rai Province in northern Thailand. The town of Mae Sai is a major border crossing between Thailand and Burma. Asian Highway Network AH2 (Thailand Route 1 or Phahonyothin Road) crosses the Mae Sai River to the town Tachileik in Burma.
One-day passes for non-Burmese nationals crossing into Burma are issued at Burma customs in Tachileik. Passports are confiscated and a temporary travel permit is issued; the permit is exchanged for the traveler's passport upon crossing back into