The oldest geological charge is the mount, typically a green hilltop rising from the lower edge of the field, providing a place for a beast, building or tree to stand. This feature is exceedingly common in Hungarian arms. Natural mountains and boulders are not unknown, though ranges of mountains are differently shown. An example is the arms of Edinburgh, portraying Edinburgh Castle atop Castle Rock. Volcanos are shown, almost without exception, as erupting, and the eruption is generally quite stylised. In the 18th century, landscapes began to appear in armory, often depicting the sites of battles. For example, Admiral Horatio Nelson, 1st Viscount Nelson received a chief of augmentation containing a landscape alluding to the Battle of the Nile.