The Spillwater Marshes
The Spillwater (also known as the Stillwater) is located in the central western part of our world and forms much of the setting for the first few sessions in my campaign. It is a large area of fenland and waterways; while there are no large settlements in the Spillwater, the city of Blackmarsh is located on its northern edge.
This was one of the first map I drew for the game, back before I'd fully worked out how the geography of the marshes worked. This caused me a lot of problems later on when I had to make routes fit with this map, but now the canon is that the cartographer never went to the Spillwater and didn't know where the castle or city were.