2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2798A proposal is presented to construct a very large air shower array in the densely populated central area of Nord-Rhein-Westfalen (NRW). The aim would be to reach a size of approximately 4000 km$^2$ to study the highest energy end of the all particle cosmic ray spectrum, as it is accessible in the northern hemisphere.3 pages, to appear in Proceedings of XXXVIth Rencontres de Moriond, Very High Energy Phenomena in the Universe, Les Arcs, France (January 20-27, 2001)Astrophysicstext