Cala Rossa is Favignana’s most famous swimming spot, a rocky amphitheatre of pale stone and startlingly blue water on the island’s east side. It is spectacular from above and even better when the sea is calm enough to swim.
The downside is no secret: access is rough, shade is scarce, and the cove gets crowded. Wear proper shoes, bring water, and consider going early or late rather than treating it as an all-day beach.