Which region of Thailand is the most mountainous?

The Northern Region of Thailand is the most mountainous due to its location in the northern part of the country, where the topography is dominated by rugged hills and mountainous terrain. This region encompasses significant mountain ranges, including the Himalayan foothills and the Daen Lao Range, which are characterized by diverse ecosystems and rich biodiversity. Additionally, the Northern Region is home to notable peaks such as Doi Inthanon, the highest mountain in Thailand. The mountainous landscape offers unique climatic and ecological conditions, making it a distinct area compared to the other regions, which feature flatter terrains and different geographical characteristics.

In contrast, the Southern, Central, and Eastern Regions have less elevation and are primarily characterized by plains, plateaus, or coastal areas, making the Northern Region stand out as the most mountainous in Thailand.