To touch by means of a mutual border, edge or end; to border on; to lie adjacent (to); to be contiguous (said of an area of land)
To border upon; be next to; abut on; be adjacent to.
To lean against on one end; to end on, of a part of a building or wall.
To encircle something or simultaneously extend in all directions.
To enclose or confine something on all sides so as to prevent escape.
Anything, such as a fence or border, that surrounds something.