hillock

The mount (also known as a hillock Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 324) is the area at the base of the shield and when so described is almost always green, and somewhere that another charge is placed, to appear more realistic, or give it a specific relationship to other charges around it. A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Mount Indeed, unlike like most of the flat, geometric shapes used to divide the field of the shield, the mount may be drawn with tufts of grass and a distinct slope!This is especially likely if the mount is described by its alternative name of hillock