Parakrama Samudra, meaning “Sea of Parakrama,” is an immense man-made reservoir in Polonnaruwa, Sri Lanka, constructed during the reign of King Parakramabahu I in the 12th century. Spanning approximately 26 square kilometers (10 sq mi) and holding millions of cubic meters of water, it was designed to support agriculture, irrigation, and water conservation, reflecting the advanced hydraulic engineering skills of ancient Sri Lanka. The reservoir consists of five interconnected tanks—Topa Wewa, Eramudu Wewa, Dumbutulu Wewa, Kalahagala Wewa, and Bhu Wewa—making it one of the largest irrigation systems of its time. It played a crucial role in sustaining Polonnaruwa’s agricultural economy, aligning with King Parakramabahu’s famous declaration: “Not a single drop of rainwater should be wasted.” Today, Parakrama Samudra remains an essential water source for local farmers and is a scenic tourist attraction offering breathtaking views, birdwatching opportunities, and boat rides. The reservoir’s serene beauty, combined with its historical significance, makes it a must-visit destination in Polonnaruwa.