The Odiel Marshes Biosphere Reserve is the second largest wetland in Huelva province after Doñana and one of the most important saltmarshes in Western Europe. The silt of the rivers Odiel and Tinto created this estuary in which we can find a paradise for the birdlife. This is a half day out to the “Kingdom of the Tide” to look for waders, seabirds and other aquatic birds. By the road that connects some of the islands on the Odiel Marshes we can get to Anastasio Senra’s Visitor Centre and continue to have interesting sightings on the mudflats going south. If time permitting, we go to El Portil to enjoy observing the scenery and birds from a platform offering panoramic views.