Andalusia

Andalusia's Atlantic coast is a different world from the Mediterranean shoreline that defines most visitors' mental image of southern Spain. The Bay of Cadiz opens onto the Gulf of Cadiz and the open Atlantic, which means proper semidiurnal tides with a mean range of 2.5 to 3.5 metres — and spring tides pushing 4 metres — on a coastline where the next significant land to the west is South America. This puts the Cadiz coast in the same tidal character as Brittany or Cornwall, not the microtidal Balearics or Costa del Sol. The city of Cadiz itself sits on a narrow peninsula jutting into the Atlantic, the bay behind it and the open ocean in front, making it one of the more geographically distinct city positions in Europe. The Atlantic energy along this coast drives a surf and wind culture that culminates a few kilometres south at Tarifa, where the Strait of Gibraltar creates a sustained wind funnel strong enough to make Tarifa one of the windiest headlands in Europe — the preferred destination in continental Europe for kitesurfers and windsurfers chasing consistent Poniente (westerly) and Levante (easterly) winds. The flap gates of the Bay of Cadiz — part of the bay's port and tidal infrastructure — are characteristic of the larger tidal exchange driving in and out of the bay on every cycle. The Guadalquivir river mouth at Sanlucar de Barrameda, 30 kilometres north of Cadiz, carries the tidal signal 80 kilometres upriver to Seville, the only river-port city in Spain that can receive ocean-going vessels. Authoritative tide data for Andalusia's Atlantic coast comes from Puertos del Estado (the Spanish State Ports Authority), which operates the gauge network along the Gulf of Cadiz and publishes official tide tables. The Instituto Hidrográfico de la Marina (IHM) in Cadiz city, one of Europe's oldest hydrographic institutions, compiles the official Spanish tide almanac. Open-Meteo Marine model predictions for the Cadiz area carry the standard caveat of plus or minus 45 minutes on timing and roughly 0.2 to 0.3 metres on height — useful for planning context, with the Puertos del Estado and IHM gauge data as the authoritative reference.