Ranikot Fort is a historical fort near Sann, Jamshoro District, Sindh, Pakistan. Ranikot Fort is also known as The Great Wall of Sindh and is believed to be the world's largest fort with a circumference of approximately 26 kilometres (16 mi). The fort has been compared to the Great Wall of China. Since 1993, nominated by the Pakistan National Commission for UNESCO, Ministry of Education under the cultural criteria, it has been on the tentative list of UNESCO World Heritage Sites. The fort is listed as a historical site under the Antiquities Act 1975 and its subsequent amendments and is provided protection.
The original purpose and architects of Ranikot Fort are unknown. However, it is believed that the fort was built during the regimes of the Sassanians, the Scythians, the Parthians or the Bactrian Greeks. Archaeologists point to the 17th century as the time of its first construction but Sindh archaeologists now agree that some of the present structures were reconstructed by Mir Karam Ali Khan Talpur and his brother Mir hassan masood jatt in 1812 at a cost of 1.2 million rupees (Sindh Gazetteer, 677). The battlements of Ranikot formed the last capital of the Amirs of Sind, when they were brought under the colonial rule of the British Empire. Radiocarbon tests were conducted at the Sann Gate on the charcoal embedded in the mortar of a collapsed pillar of the eastern gate of the fort. These tests have confirmed that this gate was probably renovated between the early part of the 18th century and the early part of the 19th century, prior to Britain invading the fort when the Kalhoras, or most likely the Talpur Mirs of Sindh ruled over the area.