I'm not sure what might be going on here, but I was trying to make a map of this location. The water body looks fine in OpenStreetMap, as it appears to match the satellite image of this location on Google Maps, but for some reason the STL file output is missing a large portion of the water body. I wonder if it might be because some of it is tagged as an intermittent water body.
43.75583646662724, -65.98087997889401