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Photo of a fence

List of boundaries

Borders and edges and barriers, impenetrable or passable.

Bis forBarrier

A barrier is something that stops people or animals getting through. Barriers may be man-made or naturally occurring.
Photo of a blockade

Bis forBlockade

A blockade is a barrier, usually put up by a military or police force, that stops people or vehicles from getting through.
Photo of a garden border

Bis forBorder

A border is the outside edge of something. Borders on book pages and gardens can be very decorative. The garden in the picture has a path around it as a border.

Bis forBoundary

The boundary of something is the edge or border of an area. The wall in the picture marks the boundary of ancient China.
Photo of the brink of a cliff

Bis forBrink

A brink is the edge of a steep drop, such as the brink of a cliff. Brink might also describe a point of change, for example "she was on the brink of a big discovery".
Photo of the edge of a building

Eis forEdge

An edge is a line or border where one thing stops and another thing starts. Edges are very important for finding your way around in the world, and most animals have eyesight designed to detect the edges of things. The picture clearly shows the edge of a building against the sky. A similar word to edge is boundary.
Photo of a horse looking over a fence

Fis forFence

A fence is a structure that people make. Fences are usually there to keep something on one side of the fence from getting to the other side, or just to mark a boundary. The horse in the picture is being kept in her paddock by the fence. Fences can be any height. In cities they are usually quite high, and on farms they are usually just high enough so whatever animal is being kept cannot jump over it.
Photo of picture frames

Fis forFrame

A frame is a rigid structure that is built to go around the edge of something. Picture frames are a pretty way of surrounding a picture. Frames for a building are put in place to mark out where the walls and other structures go, and to support the structure as the spaces are filled in with bricks or other materials.
Photo of the rim of a glass

Ris forRim

A rim is the very edge of something, usually something round like a cup or a wheel. When it is the topmost edge rather than the outer edge, it is also called the brim.
Photo of a striped ball

Sis forSurface

A surface is a two-dimensional plane. The surface of a three-dimensional object is its boundary. The surface of the ball in the picture is covered in stripes. A two dimensional object like a piece of paper has two surfaces, one on each side.