Abstract: A swimming pool, of the type having a sectionally constructed wall extending about and supporting a plastic liner, incorporates in the wall a capability of forming a wide variety of swimming pools of different shapes and sizes. Disclosed is a wall system which basically comprises a relatively small number of different types of sections. Each section has a flat web and side flanges disposed at selected obtuse or acute angles to the plane of the web. The angles incorporated in each section differ from those of the remaining sections. In this way, by abutting against each other selected sections, and by utilizing a selected number of such sections along different portions of the periphery of a swimming pool, it becomes possible to provide an almost infinite variety of swimming pool shapes and sizes.