The main Chanthaburi Range forms part of the provincial boundaries between the in-land Chachoengsao and Sa Kaeo provinces to the north and the coastal Chon Buri and Chanthaburi provinces to the south.
It is also considered to include three sub-ranges extending southward: the first in Chon Buri Province, including the peaks Khao Khiao and Khao Chomphu; the second forming part of the boundary between Chon Buri and Rayong provinces; and the third forming the boundary between Rayong and Chanthaburi provinces, including the peaks Khao Chamao and Khao Wong.
Khao Soi Dao Tai is its highest peak at 1,675 metres (5,495 ft)[4] (older sources give 1,640 metres (5,380 ft)[5]), followed by Khao Soi Dao Nuea.
Igneous rock in the form of granite is extensively found in the composition of the main range, especially in the area of the two highest peaks.
[3] The mountains feature several forested areas protected by several national parks and wildlife sanctuaries, collectively known as the Eastern Forest Complex.