It lies within the Phi Pan Nam Mountains and is home to the Yom River, which provides an essential water resource for the district.

The terrain is largely mountainous, contributing to the area’s scenic landscape, and it includes Doi Phu Nang National Park, a notable attraction.

The district is divided into three sub-districts (tambons) - Chiang Muan, Ban Mang, and Sa - which are further subdivided into 34 villages (mubans).

Key attractions in Chiang Muan include: Doi Phu Nang National Park, known for its waterfalls, caves, and rich biodiversity.

Wat Tha Fa Tai, a Buddhist temple that holds cultural and spiritual significance in the area.