Abstract: A shower bath made of stones includes natural lines of joint between edges of the floor and edges of the wall portions of the shower bath, which are spaced from each other to form gaps along the lines of joint. The gaps are filled with grout except for one gap which is a water discharge gap. The shower floor is substantially planar and inclined downwardly in a direction generally toward the water discharge gap. The discharge gap is bounded at two ends by the grout filling the adjacent gaps so that water falling on the floor can exit through the discharge gap to the drain below the floor. A drain guide has an upper channel portion that cooperates with the edge of the floor and the edge of the wall portion that form the water discharge gap. The drain guide has a lower conduit that provides fluid communication between the upper channel portion and a drain pipe disposed below the shower floor.