The Tibi Dam, also known as the Alacantí Dam, is a masonry dam on Monegre River about 18km northwest of Alacantí in Valencian Community, Spain. It is one of the oldest non-Roman dams in Europe. It was constructed between 1579 and 1594 with the purpose of using its reservoir to help irrigate areas around Alacantí. A spillway was constructed on the right side of the dam in 1697 after it partially failed due to flooding.