17. Treviño (Spain in Spain – Basque Country)
Treviño is an administrative enclave of Castile and León, completely surrounded by the Basque Country. While it doesn’t cross international borders, Treviño faces similar challenges as its global counterparts, with ongoing debates over governance, services, and regional identity. The enclave’s existence highlights how even internal boundaries within a country can generate cultural complexities and fuel disputes, making it a noteworthy case in the broader story of enclaves and exclaves.
