The plateau lies to the west of Sulaiman and Kirthar mountains, the dry hills run across the plateau from northeast to the southwest. These hills are 30,000 mm high. The Toba Kakar and Chagi ranges in the north separate it from Afghanistan. The Brahui and Makran ranges lie in the centre and coastal Makran range skirts the south of the plateau. The only river of importance are the Thob which flows into the Gomal in the north, and the Porali, Hangol and Dasht which flow into the Arabian Sea.