The Ajo estuary —or Castellanos— is the mouth of the Campiazo river, between Bareyo and Arnuero. A branch of still water that goes inland between meadows and marshes, sheltered from the Cantabrian Sea by the sandbar. Inside there are no waves or currents: it is smooth, shallow, and silent water, which is why it works so well for stand-up paddling even if you have never done it before.
The guided excursion starts on land, with a fifteen-minute introduction to paddling technique. This is followed by about two hours of touring the estuary with a local guide leading the way, stopping when necessary —sometimes to wait for the tide, which dictates the schedule— and moving at a pace that anyone can follow. No experience is required: the outing is designed for all audiences.
What you see from the board cannot be seen from the road: herons and marsh birds just a few meters away, the play of the tide filling and emptying the channels, and the riparian vegetation growing right up to the shore. The SUP equipment is included, and you will take a photo report from the tour.
The best time is usually from spring to autumn, with the appropriate tide. Those who already paddle standing up with ease and seek something more active have the alternative of a wave class on the open coast of Isla, just a few minutes away.