It was officially created on June 11, 1993, due to the dismemberment of the parish of Castro Marim.
It comprises a part of the coast of the municipality of Castro Marim, of which Alagoa Beach is part, which is integrated in the Bay of Monte Gordo.
The town that today is designated Altura actually comprises two zones: one more northern, near National Road 125 (Height proper), and another to the side of the beach, called Alagoa beach.
For about four decades the entire region that currently corresponds to the town of Alagoa / Altura consisted of some farms and fishermen’s houses. The region adjacent to the dune cord was formed by an extensive wetland and by a small coastal lagoon, of which there are references in the nineteenth century, in the Monograph of Vila Real de Santo António (work by Ataíde Oliveira), while in the higher Agricultural land devoted to rainfed agriculture and citrus production predominated. However, the urban development of the last decades has converted this Algarve locality into one of the main bathing resorts in the Algarve.