Abstract: Dismountable barriers are provided which are readily assembled and dismantled, and consist of easily handled parts. Front and rear rows of vertical horizontally elongated panels are linked end to end by locking bars which can also serve as fence standards, and cross members, preferably also linked to the panels by the locking bars, connect the rows. The space between the panels is filled with sand, gravel or other fluent material, except that cross panels may prevent the cross members and locking bars from being submerged. Short panels may be inserted between the elongated panels on one side of the barrier where it is necessary to form a bend in the latter.