The Arpa Valley (Kyrgyz: Арпа өрөөнү) is a high-altitude valley located in the south-west part of internal Tien-Shan. The valley is limited by Fergana Range to the south-west, Torugart Range, Atbashi Range to the east, Ortok Too, and Djaman-Too to the north.
"From the top of the Sur-tash pass, on the Ferghana range, a most instructive view was obtained over the plateau world to the east. Below was the Arpa "Pamir," a broad, undulating, grassy valley, with the Arpa river flowing through its centre. The Jaman Davan range, which borders the Arpa plateau on the north-east, on the north closes in and joins with the Ferghana range, thus enclosing the plateau. The Arpa river cuts through this range by a deep-cut gorge, the course of which is still dotted on the map, by an imaginary line."