A modular tabletop gaming terrain assembly has two modules directly and releasably engageable with one another. A first of the two modules is a horizontally oriented floor module including a horizontally oriented frame having a laterally extending top surface, opposing first and second side surfaces depending downwardly from the top surface, and a frontside surface depending downwardly from the top surface and extending between the first and second side surfaces. The top surface, the frontside surface, and the first and second side surfaces are aesthetically textured. A male connector projects horizontally outwardly from one of the surfaces depending downwardly from the top surface and a corresponding female slot projects inwardly into an underside of the frame from another other of the surfaces depending downwardly from the top surface.