Leigh Woods is a 2 square kilometre (490 acre) area of woodland on the south-west side of the Avon Gorge, opposite the English city of Bristol and north of the Ashton Court estate. It has been designated as a national nature reserve. Small mountain biking circuits are present in the woods and the area is a popular walking area for Bristolians. Part of the woodland was donated to the National Trust in 1909 by George Alfred Wills, to prevent development of the city beside the gorge.