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How big is 137 square miles?

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It's about 4,500,000,000,000 times as big as a Nailhead
In other words, 137 square miles is 4,564,000,000,000 times the size of a Nailhead, and the size of a Nailhead is 0.00000000000021910 times that amount.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.000000000030020 square miles. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about 500,000,000,000,000 times as big as a Ballpoint Pen Tip
In other words, the size of a Ballpoint Pen Tip is 0.00000000000000200 times 137 square miles.
(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen — a medium-tip — measures 0.000000000000270 square miles. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.