How to read this map
Each hexagon is an H3 cell. A closed depression is a
place where the terrain model holds water if nothing drains it. Colour and height show the chosen measure
for the depressions inside the cell; cells with no depression are not drawn.
Coarser resolutions are exact roll-ups of the finest one: the deepest depth, and the sum of area and volume.
A depression is a feature of the elevation model, not a flood.