The Bertak, Pijar and Puyuh area are located in the South Sumatra Basin is mostly located on mainland which is in the southeastern part of the island of Sumatra.

South Sumatra Basin is Bounded by the Tigapuluh Mountains in the north which is composed of crystaline basement rocks and Pre-Tertiary metasedimentary rocks, Bukit Barisan and Garba in the south and west, Bangka and Lingga island in the east and northeast, and Tinggian Lampung in the southeast