Buckland Warren is a 0.04-hectare (0.099-acre) biological Site of Special Scientific Interest (SSSI) east of Faringdon in Oxfordshire.This narrow strip of cultivated land between a wood and a golf course is designated an SSSI because it has a population of the nationally rare broad-leaved cudweed, which has been recorded at less than ten sites in Britain and is listed in the British Red Data Book of Vascular Plants.