To the east the Momina Klisura Gorge of the river Maritsa leads to the westernmost reaches of the Upper Thracian Plain.

[1] The surface of the Kostenets–Dolna Banya Valley is uneven, at the foothills of Rila it becomes hilly; in its center are the low terraces of the Maritsa and its tributaries.

There are hot mineral springs at the villages of Kostenets to the south and Pchelin to the north, as well as at the towns of Dolna Banya to the west and Momin Prohod to the northeast.

The valley is drained by the Maritsa, which flows in direction west–east in its southern parts, and its tributaries the Ibar, the Stara reka, the Ochushnitsa, etc.

[1] The climatic and soil conditions of the Kostenets–Dolna Banya Valley are favourable for agriculture, the main crops being cereals and potatoes.