I have just returned from a field trip to the national park of Doñana in the south of Spain with a group of my sixth form Biology students. We were shown around by Aitor who is a guide and friend. Aitor and I have introduced this area to many groups of students over the years, but this time he took me to a place that we had not visited together before and it was quite an experience. It was the highest point around and he billed it as the place where two “oceans” meet.

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