Heftimus Cave

Description
Located on the western Valorian Isles, the Heftimus Cave is vast. It is named after its most prominent inhabitant, Heftimus McPry, the penniless pirate, who used it as his sleeping place. It mainly is used by the criminal elements of Jhelom to hide out and store their stolen goods, but it also is used by monsters as a dwelling place.

The cave isn't explicitely named in Ultima VII, but it is in Ultima VI.