El Pozo de la Aguada — the Well of Watering — is a simple stone well in a small courtyard near the waterfront, easy to miss if you don't know to look for it. It marks the spot where Columbus's fleet filled its water barrels before setting out westward in September 1492, and its historical significance far outweighs its modest appearance.
The well sits on the site of the original Peraza family residence, now occupied by a small interpretive space. A short walk from both the Torre del Conde and the Iglesia de la Asunción, it completes the Columbus circuit of the town and gives San Sebastián a claim few other places on earth can make: that the water drawn here helped keep the crew of the Santa María alive long enough to discover the Americas.