West of Albufeira the coast breaks into a run of small sandstone coves, and Praia do Castelo is one of the best-formed of them — a pocket of pale sand held between ochre cliffs and rock outcrops weathered into the battlements that gave the beach its name. It sits out by Sesmarias, between Praia da Coelha and the longer sands at Galé.
Small is the operative word. The cove photographs beautifully — castle rock, clear water, cliff colour — and it fills accordingly; on a summer afternoon it can feel like everyone had the same good idea at the same time. The compensation is that the rock does not care when you visit: shoulder-season and morning visits get the same formations with room to work.
When to go: morning, both for elbow room and for light on the rock; May, June and September give the cove its best ratio of colour to crowd.
Who it’s for: cove collectors working the Albufeira–Galé run; families who prefer a contained, sheltered pocket to a long open beach; photographers who want rock texture at close range. If you need a big stretch of sand to walk, Galé is next door.