2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113992This thesis investigates cusp cross-sections of arithmetic real, complex, and quaternionic hyperbolic $n$--orbifolds. We give a smooth classification of these submanifolds and analyze their induced geometry. One of the primary tools is a new subgroup separability result for general arithmetic lattices.76 pages; Ph.D. thesisGeometric TopologyGroup Theorytext