There an area on the map, along the river Vol where there is a section with 3 lakes and a branch of the Vol. it's an area about 26 miles in space, bordered on 3 sides (plus a little on the 4th side) with the river/lakes. It looks like a nice confined space and it's mostly grasslands (rolling hills). Unless you need a more hilly area, then there is a location to the east of the Kimmerian Stepp, it's a 26-mile grassland surrounded by hills, but it's more like a week travel.
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BlackKnight, AKA Sausage
Older than Dirt, Crusty, and set in my ways. Been playing TTRPGs for over 45 years...