Heritage Open Day: Step into one of Aldershot’s best-kept natural treasures - Rowhill Nature Reserve. Covering 55 acres on the Aldershot-Farnham border, this beautiful reserve is home to ancient woodland, heathland, ponds, streams and the source of the River Blackwater Visit the Rowhill Field Centre to learn more about the reserve’s wildlife, history and conservation work from the dedicated volunteers who help care for this special place.