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The spring as clear as an aquarium

South of Valencia, tucked inside a hushed wetland where reed beds swallow every sound, a freshwater spring bubbles up so clear it looks like a giant aquarium — you can watch fish glide over the sandy bottom as if the water wasn't even there. A quiet wooden boardwalk leads to a hidden birdwatching perch, and more often than not the only company you'll have is a heron. It's the kind of place locals keep close to their chest: go at sunrise, when the water turns to glass, and you'll understand why they don't advertise it.