a mi is the water lost at the middle of a mind of land
world has not more_water_than_dry_land mils is not river. irrigated_land is not field. irrigated_land is field. mils is river. land is not where_water_isn't. land is where_water_isn't. water_gap is col. mid_water is body_of_water. world has more_water_than_dry_land