Mae Sai (Thai: แม่สาย, pronounced [mɛ̂ː sǎːj]; Shan: မႄႈသၢႆ, pronounced [mɛ.sʰǎj]), is home to the district headquarters of Mae Sai District in the top of Chiang Rai province, Thailand. Mae Sai is a major border crossing between Thailand and Myanmar. Asian Highway Network AH2 (Thailand Route 1 or Phahonyothin Road) crosses the Mae Sai River to the town Tachileik in Myanmar. The town of Mae Sai and Tachileik are the bi-national conurbation shared between Thailand and Myanmar.