Ranikot is the most talismanic wonder of Sindh. Visible from five kilometers away its massive undulating walls twist and dip over the hills. With the circumference of about twenty kilometers, its walls, built with dressed sandstone and reinforced with 45 bastions along the outer wall, of which 7 are rectangular and the remaining are round. All modified through the ages to accommodate the use of gunpowder, this perhaps makes it the largest fort in the world.

It is reputed to be the largest unexplored fort in the world. The purpose of its construction and the reason for the choice of its location are still unknown. The fortification wall of the gigantic fort of Rani Kot is 35 kms in length and connects barren hills. The fort was built in the first quarter of the l9th century. The fortification wall, which follows the natural contours of the hilly area, has solid semi-circular bastions at intervals.

The fortification wall runs on three sides of the area, while on the northern side the lofty peaks of the higher hillocks serve as a wall. A small fortress, about 5-6 miles inside the main gate, appears to have been the royal residence for the ruling family of Mirs. The double door gate lies on the south of the fortress. Inside the gate two nitches are decorated with floral designs and carved stones. The whole architecture of the fort is restricted to stone and lime.

Ranikot is a large fort in the region of the Kirthar Range, about 30 km southwest of Sann, was in the Dadu district of Sindh now in district Jamshoro, approximately 90 km north of Hyderabad in Pakistan. It is one of the largest forts in the world. It has an approximate diameter of 6 km. Its walls are on the average 6 meters high and are made of gypsum and lime cut sandstone and total circumference is about 20 km. While originally constructed for bow and arrow warfare it was later expanded to withstand firearms.