Tourist development in Katelios began is relatively low key but with new apartment blocks and hotels being built every season.
Katelios is located in the south-east of Kefalonia, about 25 kilometres from Argostoli. It has a long and flat sandy beach with a major turtle nesting beach at the western end.
Katelios has two main areas. The beach area has a few tavernas and shops strung out beneath large plane trees while, about one kilometre inland from the beach, are found most of the holiday hotels and apartments surrounded by olive groves.
The beach at Katelios is not as good as neighbouring Skala. It has a long strip of sand and shingle with rocks pools here and there and a gentle slope into the sea.
Katelios is a very good base for walkers with many footpaths in an noted for wildflowers and for birds. The endangered loggerhead turtles nest on nearby beaches and a small information centre sets out the details.
The Marine Turtle Project is staffed by volunteers from all over the world and looks after the turtle beach is at Mounda, just around the headland to the west.
Local places of interest are the wine estates at Mavrata, noted for its famous Robolla wines, the impressive Sissia Monastery and the church of the Virgin of the Snakes. There are regular bus services to Poros via Skala and to Argostoli.