Correction for the length of a Grain of Sand
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How wide is 36 nautical miles?
It's about 55,000,000 times as long as a Grain of Sand
The length of a Grain of Sand is about 0.0000006750 nautical miles.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 1.25 mm. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.