Smart's and Prey Heaths is a 39-hectare (96-acre) biological Site of Special Scientific Interest south-west of Woking in Surrey.

[1][2] These mainly damp heaths are dominated by ling, cross-leaved heath and purple moor-grass.

Other plants include creeping willow, dwarf gorse, oblong-leaved sundew, deergrass and round-leaved sundew.

[3] The heaths are crossed by footpaths.