The Old Well and Cistern are significant parts of the Sidon Sea Castle, a prominent fortress located in the coastal city of Sidon, Lebanon. Constructed by the Crusaders in the 13th century on a small island connected to the mainland by a causeway, the castle has stood as a silent sentinel guarding the ancient port of Sidon. Despite suffering damage over the centuries, the well-preserved Old Well and Cistern provide insights into the water storage solutions of the era. The cistern, in particular, is an underground chamber that was used to collect and store fresh water, a precious resource for any coastal fortress. Archeological evidence suggests that the castle, including these structures, was built over the remains of a Phoenician temple and later Roman structures, showcasing layers of history in a single site. The old well and cistern today are a testimony to the ingenuity of medieval architects and engineers, and they draw historians and tourists alike to marvel at the resilience and historical depth of Sidon's fortifications.