The Khao Luang mountain is the highest summit of a massif of several hills with steep slopes. It is part of the Nakhon Si Thammarat Range, a subrange of the Tenasserim Hills.
Geologically this mountain formation consists of a granite core under loose soils. On steep slopes, the soil covering the mountains can cause landslides when saturated with water.
Some of the forests of the area were felled to give way to rubber plantations.[2