(subclass Estuary BodyOfWater) | Geography.kif 5179-5179 | Estuary is a subclass of body of water |
(subclass Estuary SaltWaterArea) | Geography.kif 5180-5180 | Estuary is a subclass of salt water area |
(subclass Estuary Inlet) | Geography.kif 5181-5181 | Estuary is a subclass of inlet |