border

Form the boundary of; be contiguous to.

Lie adjacent to another or share a boundary.

Extend on all sides of simultaneously; encircle.

Provide with a border or edge.

Enclose in or as if in a frame.

A strip forming the outer edge of something.

“the rug had a wide blue border”

A decorative recessed or relieved surface on an edge.

A line that indicates a boundary.

The boundary of a surface.

The boundary line or the area immediately inside the boundary.