North of Kalamata, away from most of the tourists, is Arcadia and to the West is Elis. We have yet to explore much of this area but have visited the Lousios Gorge more than once, well twice actually, and we love the drive here from our main base in the south.
As you venture north it gets pretty mountainous with deep valleys and lush vegetation. There are even ski lodges which surprised us on our first visit. Most people have heard of Ancient Olympia but the Temple of Apollo is rarely visited.
I often shoot through Arcadia on the motorway on the way to or from Nafplio and I do need to spend more time exploring this area. A recent detour at Nestani to have a picnic was wonderful.