An implement for demarcating an area, in particular for restricting the freedom of movement of animals walking about freely, is provided with a demarcation element (10) which is capable of being wound and unwound and being tightened. To said implement there is connected at least one vehicle (1, 1', 1 "), which is suitable for bringing an end of a straight, tightened section (12) of the demarcation element (10) into a desired position. The other end of the straight, tightened section (12) can be positioned with the aid of a further vehicle (1, 1', 1") or by means of a fixed reference point (18). The implement is compact and yet extremely flexible. Said vehicle (1, 1', 1") being provided with angle measuring means (14) for determining the angle between a reference direction (19) of the vehicle (1, 1', 1") and the direction of the substantially straight extending section(s) (12) of the demarcation element (10).