border
noun
a line that indicates a boundary
the boundary line or the area immediately inside the boundary
the boundary of a surface
Synonymsedgea decorative recessed or relieved surface on an edge
a strip forming the outer edge of something
“the rug had a wide blue border”
verb
extend on all sides of simultaneously; encircle
“The forest surrounds my property”
form the boundary of; be contiguous to
Synonymsboundenclose in or as if in a frame
“frame a picture”
provide with a border or edge
“edge the tablecloth with embroidery”
Synonymsedgelie adjacent to another or share a boundary
“Canada adjoins the U.S.”
“England marches with Scotland”
Source: WordNet 3.1, Princeton University
