While the land to the east is fairly flat, the Tenasserim Hills and Dawna Range lie to the west.

The monsoon season runs from May through October, with heavy rain and somewhat cooler temperatures during the day, although nights remain warm.

Route 105, through Mae Sot, forms one of two major transnational roads through the Tenasserim Hills to Burma.

On the north side it leads to Lampang, Chiang Rai, and the border with Burma at Mae Sai.

Route 12 leads east to Sukhothai, Phitsanulok, Chum Phae, Khon Kaen, Kalasin, and the border with Laos at Mukdahan.