Fernhurst is a village and civil parish in the Chichester District of West Sussex, England, on the A286 Milford, Surrey, to Chichester road, 3 miles (4.8 km) south of Haslemere and 4 miles (6.4 km) north of Midhurst. The parish includes the settlements of Henley Common, Kingsley Green and Bell Vale, lies within the boundaries of the South Downs National Park and is surrounded by hills.

The River Lod is a short river draining about 52 km2 (20 sq mi) of north west Sussex. The main source is on the Greensand Ridge at Marley Heights near Haslemere, about 140 metres (460 ft) above sea level. From here it flows west past Lynchmere, then south to Furnace Pond, where iron cannon were cast during the English Civil War. It then turns south east, flowing south of Fernhurst to Lickfold and Lurgashall where it formerly powered Lurgashall Mill, now moved to the Weald and Downland Open Air Museum. From Mill Farm it heads south between high banks, which it only overflows after the heaviest of rainfalls, passing between the hills of Lodsworth and River to Halfway Bridge on the A272 road then joining the River Rother at Lods Bridge.