Karnala Fort sits at 1,560 feet on a rocky hill rising sharply from the forest of the bird sanctuary. The climb from the sanctuary entrance takes around an hour through dense woodland — steep in places but well-marked. The remains of the fort include walls, cisterns, and a gateway, scattered across the upper slopes.
The summit is dominated by a 125-foot isolated rock pinnacle, "the thumb," which is a classic technical rock-climbing challenge. Non-climbers can walk around its base for the views — on a clear day you can see the Arabian Sea to the west. The fort is best visited in the early morning when the heat is manageable and the birdwatching on the trail up is at its best.