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How big is 138.80 square miles?

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It's about one-twenty-five-thousandth as big as China
In other words, 138.80 square miles is 0.000037458770 times the size of China, and the size of China is 26,696.02 times that amount.
(a.k.a. People's Republic of China, a.k.a. 中华人民共和国, a.k.a.中華人民共和國 , a.k.a. Zhōnghuá Rénmín Gònghég) (UN mainland area figure)
Mainland China, as measured by the United Nations (excluding China's Special Administrative Regions — Hong Kong and Macau — and disputed territories such as Taiwan, Askai Chin, and the Trans-Karakoram Tract), occupies 3,705,407 square miles in total area . China is the the most populous country in the world and the third or fourth largest (depending on areas included in the measurement) in total area.
It's about one-twenty-five-thousandth as big as United States
In other words, 138.80 square miles is 0.000036583110 times the size of United States, and the size of United States is 27,335.02 times that amount.
(a.k.a. United States of America, a.k.a. America, a.k.a. USA, a.k.a. US)
The third or fourth largest country in the world (there is some dispute in how China's total area is measured), the United States measures 3,794,100 square miles in total area. The United States' economy is the fifth-largest in the world, comprising a quarter of nominal global GDP.
It's about one-thirty-thousandth as big as Canada
In other words, 138.80 square miles is 0.00003600420 times the size of Canada, and the size of Canada is 27,774.50 times that amount.
Canada measures 3,855,100 square miles in total area. It is both the second-largest country in the world and one of the most-sparsely populated, in addition to having the longest coastline of any country in the world — 243,000 km (151,000 mi).
It's about 30,000 times as big as Trafalgar Square
In other words, the size of Trafalgar Square is 0.0000330 times 138.80 square miles.
(a.k.a. Charing Cross) (City of Westminster, London, England, United Kingdom)
Trafalgar Square, a public square in London, measures about 0.0046 square miles. m in total area. At the center of the Square is the 52 m Nelson's Column monument, built in the 1840s.
It's about 40,000 times as big as a City Block (Manhattan)
In other words, the size of a City Block (Manhattan) is 0.0000300 times 138.80 square miles.
(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
A Manhattan city block measures about 200 m between the Northeast-Southwest streets by about 60 m between the Northwest-Southeast streets for a total area of about 0.004 square miles. There are roughly 2,000 blocks within the city, representing one of the most prolific applications of the city planning grid plan in history.
It's about 45,000 times as big as The Palace of Holyroodhouse
In other words, the size of The Palace of Holyroodhouse is 0.0000230 times 138.80 square miles.
(a.k.a. Holyrood Palace) (Royal Mile, Old Town, Edinburgh, Scotland, United Kingdom) (Palace without gardens)
The Palace of Holyroodhouse, the residence of the British Monarch in Scotland, measures about 0.0031 square miles, on a total grounds area of about 0.015 square miles. Each year, the Palace hosts a Garden Party, serving 8,000 guests from a 150-meter-long buffet table.
It's about 45,000 times as big as Seal Island
In other words, the size of Seal Island is 0.0000230 times 138.80 square miles.
(Western Cape province, South Africa)
Seal Island, named for the tens of thousands of Cape Fur Seals that live there, measures about 0.0031 square miles. The large number seals attract great white sharks, who circle the island in a so-called "Ring of Death."