is this correct? A highway:track within a residential area?

what's the name of this highway:residential road?

Is there a fire_station in Echte?

Is there a fire_station in Sebexen?

missing island within the pond

Is there a name for this village?

Campingplatz Hardegsen or Ferienpark Solling?
I think only one of them is needed.

missing conntection of the parts of this river

amenity:school as area, it's not residential.