Rough Castle Fort is a Roman fort on the Antonine Wall roughly 2 kilometres south east of Bonnybridge near Tamfourhill in the Falkirk council area, Scotland. The Antonine Wall was built around 143 AD and stretched from Bo'ness on the River Forth to Old Kilpatrick on the River Clyde. The fort is the best preserved of the 19 forts constructed along the length of the Wall. Built against the southern rear face of the Wall, the fort was defended by 6 metre thick turf ramparts and surrounded by defensive ditches. Gateways were provided through the main Wall to the north, and also through the walls on the other three sides of the fort. Causeways were then constructed across the main Antonine and secondary defensive ditches, affording easy access to and from the fort.