1. Bilbao, Spain: Located in the Basque Country region of Spain, Bilbao is the largest city in the Basque Country and a major cultural and economic center. It's famous for the Guggenheim Museum Bilbao, a striking architectural masterpiece.
2. San Sebastián, Spain: Also in the Basque Country, San Sebastián is a coastal city known for its beautiful beaches, elegant architecture, and Michelin-starred restaurants. It's a popular tourist destination.
3. Bayonne, France: Located in the French Basque Country, Bayonne is a historic city known for its charming old town, its Basque culture, and its annual festival celebrating the Basque tradition of "Fêtes de Bayonne".
These cities are all important centers of Basque culture, language, and identity. They are also home to a large Basque population.