The view comes first. From the walled hamlet of Cacela Velha — a church, a fort, a handful of houses — you look down on a turquoise channel of the Ria Formosa and the long white sandbar that carries the actual beach. Getting onto that sandbar is the ritual: at low tide people wade across the channel below the village; the rest of the day, small boats shuttle bathers over from the Fábrica jetty a few minutes west. Either way you arrive wet-ankled on a barrier island with the lagoon on one side and the open Atlantic on the other.
The beach itself is the eastern Algarve at its purest — kilometres of bare sand, no bars, no umbrellas to rent, just shells, dunes and the water clarity the lagoon is famous for. The channel side stays warm and shallow; the ocean side has actual waves. Oyster farms work the lagoon here, which tells you what the water quality is like.
When to go: check the tide before you check the weather. Low tide opens the walk-across and drains the lagoon into sculpted sandbanks — the best light on all of it is early, before the boats get busy. Bring everything you need; there is nothing to buy on the island.
Who it’s for: photographers chasing the lagoon-and-sandbar frame from the village walls; swimmers who want a warm channel and open sea in one visit; anyone allergic to developed beaches.