On the northwestern part of the island is one of the best options for swimming if you're staying in Ia. Start following the road to Ammoudi and at a left turn you'll see signs for the beach Katharos. A small path will lead you to the beach. The beach consists of black sand and pebbles while in the water there are large round stones. The water is crystal clear and refreshing. Katharos is an ideal choice for swimming during the sunset because here the sun sets over the water.