The invention relates to a method and apparatus for remediating land that is contaminated by a combustible material, in particular, land contaminated with non- aqueous phase liquids (NAPLs). In an embodiment of the invention, a method for remediating land that is contaminated by a combustible material is disclosed which includes the steps of locating a subterranean volume of combustible material such as a DNAPL (12) in land (10) to be remediated, and igniting the combustible material (12) to combust the material and thereby remediate the land (10). By monitoring combustion of the material, combustion may be optimised by, for example, supplying an oxidant or a combustion suppressant.