Photo of a fence

List of boundaries

Borders and edges and barriers, impenetrable or passable.

Photo of a blockade
Attribution-Sharealike

Bis forBlockade

Photo of a garden border
Attribution-Sharealike

Bis forBorder

Photo of the brink of a cliff
Attribution-Sharealike

Bis forBrink

Photo of the edge of a building
Attribution-Sharealike

Eis forEdge

Photo of a horse looking over a fence
Attribution-Sharealike

Fis forFence

Photo of picture frames
Attribution-Sharealike

Fis forFrame

Photo of the rim of a glass
Attribution-Sharealike

Ris forRim

Photo of a striped ball
Attribution-Sharealike

Sis forSurface

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And also ...

Perimeter.