Best beaches in South Island

1 ranked beach in South Island, Cosmoledo Atoll

Ranked by the OnlyBeaches Index (OBI) — a 1-10 score blending water purity, conditions, crowd levels and vibe. Updated every 30 minutes.

All beaches in South Island

1

Anse Robinson Cosmoledo

Quiet beach; limited visitors; perfect for exploration and photography

7.0

What makes South Island's beaches stand out?

South Island sits in Cosmoledo Atoll, Seychelles and is home to 1 ranked beach on OnlyBeaches. Every beach here is scored by the OnlyBeaches Index — a 1-10 metric blending water purity, live conditions (waves, water temperature, wind), crowd intelligence and vibe.

Whether you're after the highest-scoring beach in South Island or a quieter hidden cove, the list above is refreshed every 30 minutes using live Stormglass and OpenWeather data.