(1)It shall be the duty of the Countryside Agency to prepare, in respect of England outside Inner London, maps which together show—
(a)all registered common land, and
(b)all open country.
(2)It shall be the duty of the Countryside Council for Wales to prepare, in respect of Wales, maps which together show—
(a)all registered common land, and
(b)all open country.
(3)Subsections (1) and (2) have effect subject to the following provisions of this section and to the provisions of sections 5 to 9.
(4)A map prepared under this section must distinguish between open country and registered common land, but need not distinguish between different categories of open country.
(5)In preparing a map under this section, the appropriate countryside body—
(a)may determine not to show as open country areas of open country which are so small that the body consider that their inclusion would serve no useful purpose, and
(b)may determine that any boundary of an area of open country is to be treated as coinciding with a particular physical feature (whether the effect is to include other land as open country or to exclude part of an area of open country).