A panel having a core, a top side, a bottom side, and edge pairs provided on opposite panel edges. At least one first edge pair has complementary locking elements. One locking element is a locking groove on a groove side of the edge pair and the complementary locking element is a locking tongue on a tongue side of the edge pair. The locking tongue of a first panel can be placed against the locking groove of a second panel of the same kind when the first panel is tilted, and the two panels can be locked to one another interlockingly by a rotating joining movement of the panels relative to one another. The form fit counteracts moving apart of the locked panels specifically in a direction that lies in the plane of the locked panels and is simultaneously perpendicular to the locked panel edges. The locking tongue has, on a top side, a contact surface directed to the panel top side. The top groove wall has a touch surface designed so that when two panels are in the locked state, the touch surface is mated to the contact surface of the tongue top side. At the front of the locking tongue a rounding adjoins the contact surface so that the rounding forms a cross-sectionally round free end of the locking tongue so that a round transition to the tongue bottom side is created. The rounding of the locking tongue has a radius at least equal to the distal extent of the contact surface.