The Aksu Gorge is the dramatic centrepiece of the reserve — a vertical-walled canyon carved by the Aksu river. The standard route is a two- or three-day trek with overnight camping near the rim, descending to the river on the second day. The descent is steep and requires reasonable fitness, but the views from the bottom — looking up at 500 metres of cliff face with snow peaks beyond — are exceptional.
Wildlife inside the gorge includes Siberian ibex on the cliff ledges, golden eagles riding the thermals, and occasional sightings of brown bears feeding on mulberries in late summer. A horse-supported trek is gentler on the knees if a multi-day walk is too much.