(Plates 1-12) T H E RIVER GUADALQUIVIR flows a distance of some 360 miles in Andalusia in southern Spain, before entering the Atlantic Ocean below Sanlucar, about 70 miles north-west of Tarifa and the narrowest part of the Straits of Gibraltar. For the last 50 miles of its course, from below Coria (near Seville), it traverses the marismas or marshes of its delta--the greatest area of swamp in the ...

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