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Heronissos

Small sandy beach with a fantastic taverna and great snorkling
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Kamares

One of the longest beaches in the Cyclades, shallow enough so you don't have to worry about your kids, with tavernas
and cafes bordering it
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Kamares
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Vathi

One of the most beautiful beaches in Greece with fine sand and Manolis taverna and others.
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Apokofto

Sandy beach with rocky shelf near Chrysopigi. Good swimming and snorkling and two excellent tavernas.
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Agia Marina

Far side of Kamares with nice sandy beach and rocks beyond the settlement for nude bathing and snorkling.
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Pharos

Three beaches, several restaurants and a hotel at fasalou which is the unofficial nudist beach.
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Chrysopigi

Great swimming, sunbathing and diving in the small rocky coves and out on the point.
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Kastro

Small stony beach with flat stones great for sunbathing and good snorkling
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Platiyialos

Large sheltered beach with hotels and restaurants, looks like a resort area but is not crowded except in August.
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Poulati

Small stone beach great for snorkling and a popular hang-out for young people who want to get away from the crowds.
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Vathi
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There are more photos of beaches, better ones actually, in my Sifnos Postcards section
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