Os de Civís is an unusual geographic phenomenon located in the Spanish Pyrenees in the Lleida province, where access is only possible through neighboring Andorra. This peculiar situation arises because it is a periclave—a territory not separated from its country yet only accessible by crossing a foreign state. Such cases are rare in Spain, adding a layer of intrigue to this small village.

The village administratively belongs to the municipality of Valls del Valira in the Alt Urgell region of Lleida. Despite its official status as a part of Spain, the only road leading to the community is the CG-6, which starts in Aixovall, Andorra. This unique access route illustrates how geopolitical borders can create unusual local situations, impacting travel and regional interaction.

The existence of Os de Civís highlights significant aspects of geography and politics. The designation of periclave not only underscores how states can influence accessibility but also could drive curiosity and tourism to such areas. Understanding these geographical quirks can enhance our appreciation of local cultures and the complexities of national borders.