Abstract: The invention relates to an elongated floating barrier for use in controlling and concentrating substances floating on a liquid surface, preferably oil floating on a water surface. The barrier comprises a front shield towards the front surface (2) of which the substances are deposited and transported sideways along the shield as the barrier is moved relative the liquid surface. The front shield is inclined in such a way that its upper edge (5) is abaft its lower edge (6) and a towing means (4) is attached to the lower edge of the shield and arranged to give a mainly horizontal pull in the barrier when it is moved relative the water surface.