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Geologic Touchstones

Source GameMastery Guide pg. 147
Below are several handy bits of trivia about the real world that can help with fantasy map design.

Deserts and forests each cover approximately a third of the Earth’s land surface.
Oceans cover approximately 70% of the Earth’s total surface.
The peak of Mount Everest, at 29,028 feet, is the highest point above sea level on Earth. (The tallest mountain on Earth, on the other hand, is Mauna Loa, which from seabed to peak rises 33,500 feet.)
The lowest point in the ocean is the Mariana Trench, at a depth of 35,797 feet.