This is the name of the large beach stretching from just west of Quarteira, after the marshes and river, all the way to Olhos d'Agua. The name is, however, often applied by tour operators to any hotel along this piece of coast. Do check carefully where you are going if the name is quoted as Falesia; you might be at either end or stuck right in the middle.
See also the surrounding areas of Albufeira - The Strip, Albufeira Town, Acoteias and Olhos d'Agua.