Biblioteca

The orange background vertical sign is a tourist-cultural interest sign that identifies a geographical or ecological interest element, in this case the Mondego river. As a river is an element of nature, this sign indicates the presence of natural heritage. The remaining options are incorrect because the sign does not refer to cultural heritage, which would identify monuments, museums or works of historical and artistic value created by man. Nor does it indicate entry into a broad geographical or administrative region, but rather a specific point of natural interest.