Waterfall of o río Tronceda Nature · Mondoñedo, Mariña Central, Lugo Image of Mondoñedo, not of the place itself. A waterfall on the course of the Tronceda, one of the streams that come down from the sierra towards the basin of the Masma; its pools set among blocks of slate are a traditional summer bathing spot in the concello. Photo: José Antonio Gil Martínez (CC BY 2.0) What to see and do in Mondoñedo