Flooring panel or wall panel and use thereof

Flooring panel or wall panel, preferably of thermosetting laminate having two pairs of parallel/side edges (2, 3 and 4, 5 respectively), two of these side edges being provided with a locking means in the form of a groove (6) and the other two with a tongue (7) fitting in the groove (6) whereby a tongue/groove joint for assembling of the panels is formed, characterized in that the groove (6) and the tongue (7) are made of a water tight material and formed with a snap-together joint including one or more snapping webs or the like (9) with corresponding cooperating snapping grooves (10), that the groove (6) in front of the snap-together joint has an entrance opening (8) and inside the snap-together joint continues in a stabilizing groove (13), that the tongue (7) is formed with a rear neck (11) intended to fit in the entrance opening (8) and a forwardly protruding stabilizing part (12) situated in front of the snap-together joint and intended for a tight fit in the groove (13), whereby connecting panels (1) when assembled by the snap-together joints and the stabilizing parts (12) in the stabilizing grooves (13) are fixed to each other and prevented from unintentional separation while at the same time a rigid floor covering or wall covering respectively with water tight joints and without unintentional gaps between the panels is obtained.