Sandy River.
This was the start of the border between the north and the south. The lake waters from the snowy mountain flowed down and divided into two rivers, one south and one north. The central part was a river delta.
Soil erosion in that area was very severe; caused mainly by excessive reclamation and deforestation. The desertified soil rushed into the flowing river, making the whole river look turbid and yellowish. If the Druids hadn't intervened, there might have been another terrible disaster.
At least in Soran's memory, the river diverted to form a terrain similar to a giant lake.
This area was the territory of the somewhat wise Lizardmen.
Large groups of Lizardmen populated this area. They were amphibians, so this was the most suitable place for them to live.