An indention and cavity with a net sack or similar structure (into which the balls are to be struck) at each corner and one centered on each side of a pool or snooker table.
The area of the field to the side of the goal posts (four pockets in total on the field, one to each side of the goals at each end of the ground). The pocket is only a roughly defined area, extending from the behind post, at an angle, to perhaps about 30 meters out.