Cubic Kilometer [km³]
The cubic kilometer (km³) is a unit of volume in the metric system, representing the volume of a cube with edges one kilometer in length.
It is used to measure very large volumes, such as the capacity of lakes, oceans, or large geological formations.
Summary:
1 cubic kilometer = volume of a 1 km × 1 km × 1 km cube
Equals 1 billion (10⁹) cubic meters
Used for large-scale volume measurements in geography and earth sciences