if something is a whole of something then that something can be lost in that something
abandoned_thing is not tangible_thing. abandoned_thing is tangible_thing. lost_river is tangible_thing. lost_river is not natural_thing. whole is object. lost_river is natural_thing. mammal_whole_body is not tangible_thing. artifact is not whole. lost_river is not tangible_thing. burnt_thing is not tangible_thing.