Sollube is a mountain located in Bermeo, Biscay, in the Basque Country of Spain.

It is situated on the left bank of the Urdaibai estuary, and constitutes one of the limits of the reserve.

It is one of five "horn mountains" (Spanish: montes bocineros, Basque: deiadar-mendiak) in Biscay, peaks that were once used to announce General Assemblies in the region with horns and lights.

The four other "horn mountains" include Kolitza, Ganekogorta, Gorbea and Oiz.

[2] This article about a location in the Basque Country, Spain, is a stub.