El Gran Derbi — Sevilla vs Real Betis

El Gran Derbi between Sevilla and Real Betis is widely regarded by football anthropologists as the most emotionally intense city derby in world football. Sevilla and Betis fans are not merely separated by geography — they come from different socioeconomic backgrounds (Betis has historically been the working-class club). Violence between rival fans at this fixture has required the Spanish national police, Europol, and international UEFA monitoring. The Derby is so significant that Seville effectively shuts down for 48 hours around match day.