Abstract: The invention relates to a ground covering of pentagonal shaped concrete slabs (F.sub.1) placed against another with joints. The shaped slabs are simple to produce and simple to lay and in order to give such a covering an appearance similar to a ground covering of irregular quarry slabs each shaped slab has two adjacent straight sides of equal length disposed at an obtuse angle, two adjoining concave sides of equal length and equal curvature, and a convex side disposed therebetween which is twice the length of the concave sides and has a curvature corresponding to the curvature of the concave sides. Together the three shaped slabs form a group of three, the straight sides abutting one another with the formation of a star-shaped joint. The outer convex sides of one group of three abut the concave sides of the adjacent group of three and vice versa.