S₁U₁B₃B₃A₁S₁I₁N₁

12 points

SUBBASIN is validvalid

a section of an area drained by a river [n SUBBASINS]

83,976 of 196,601 in NWL2023·also valid in CSW24

a section of an area drained by a river [n -S]

237,371 of 280,887 in CSW24·also valid in NWL2023