2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204835In this note we describe the contribution from non-handlebody geometries to the partition function of three-dimensional pure gravity with negative cosmological constant on a Riemann surface of genus greater than one, extending previous considerations for handlebodies.15 pages, 8 figures; explanations and references added in revised versionHigh Energy Physics - TheoryOn Non-handlebody Instantons in 3D Gravitytext