Halfway the beautiful bay of Karathona hidden in the rock there is a small chapel dedicated to Mary. It is a special place with a very beautiful view away from the (in summer) busy beach.
From Nafplio take the road to Karathona. Don't take the way to beach but keep on the main road. Halfway the bay there is a small road on your left. Leave the car there and walk about 200 m. to the chapel. The cache is just outside the entrance to the stairs hidden in a rock.