Thursley National Nature Reserve is one of the largest remaining fragments of Surrey heath and includes areas of lowland heath, mire and woodland. The site supports a range of typical heathland wildlife including large invertebrate populations. The best time to visit the reserve is between May and September. The reserve's mixture of mire and wet heath is one of the finest examples of its type in southern England. The site contains bog pools, sphagnum lawns and, in drier areas, tracts of cross-leaved heath on the sandy soils.