La sima de Marizulete Nature · Lezaun, Tierra Estella, Navarra Image of Lezaun, not of the place itself. The Basque place-name of Lezaun — from 'leze', cave or sinkhole, and 'gune', place — refers to the sima de Marizulete, a karst cavity near the village in the foothills of the Sierra de Urbasa and Sierra de Andía. Photo: Basotxerri (CC BY-SA 4.0) What to see and do in Lezaun