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How big is 138.80 square miles?

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It's about 900 times as big as The Mall of America
In other words, 138.80 square miles is 920 times the size of The Mall of America, and the size of The Mall of America is 0.0011 times that amount.
(a.k.a. MOA, a.k.a. MoA, a.k.a. Megamall) (Bloomington, Minnesota) (total area)
The Mall of America contains over 520 stores and 6.92 km (4.3 miles) of total store frontage in an area totaling 0.150 square miles. At the middle of the mall is a 0.011 square miles amusement park featuring 27 rides.
It's about one-nine-hundred-fiftieth as big as The Great Barrier Reef
In other words, 138.80 square miles is 0.00103 times the size of The Great Barrier Reef, and the size of The Great Barrier Reef is 971 times that amount.
(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 134,000 square miles. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.
It's about one-one-thousandth as big as Montana
In other words, 138.80 square miles is 0.00094394541 times the size of Montana, and the size of Montana is 1,059.38330 times that amount.
(United States)
The "Treasure State," Montana measures 147,042.40 square miles in total area. The northwest corner of Montana is home to Flathead Lake, the largest freshwater lake in the continental United States with a surface area of 191.506670 square miles.
It's about one-one-thousandth as big as California
In other words, 138.80 square miles is 0.00084791543 times the size of California, and the size of California is 1,179.36290 times that amount.
(United States)
The "Golden State," California measures 163,695.570 square miles in total area. California is home to both the highest point — Mt. Whitney at 4,421 m (14,505 ft) — and lowest point — Death Valley at 85.5 m (282 ft) below sea level — in the continental United States, the two of which are separated by just 123 km (76 mi).
It's about 1,500 times as big as Soccer City
In other words, the size of Soccer City is 0.00067 times 138.80 square miles.
(a.k.a. FNB Stadium, a.k.a. First National Bank Stadium, a.k.a. The Calabash) (Cape Town, Western Cape province, South Africa) (Nasrec, Johannesburg, Gauteng, South Africa) (total stadium footprint)
Soccer City, the football (soccer) and rugby stadium measures 0.093 square miles and is the largest stadium in the country of South Africa and largest on the continent of Africa. The Stadium was the site of Nelson Mandela's first public speech upon being released from prison, and the site of Mandela's public memorial in 2013.
It's about 1,500 times as big as Washington National Cathedral
In other words, the size of Washington National Cathedral is 0.00063 times 138.80 square miles.
(a.k.a. Cathedral Church of Saint Peter and Saint Paul) (Washington, DC) (total plot)
Sitting atop the 115 m (377 ft) tall Mount Saint Alban at the corner of Massachusetts and Wisconsin Avenues, Washington National Cathedral sits on a landscaped, 0.089 square miles plot.
It's about 1,500 times as big as The United States Capitol
In other words, the size of The United States Capitol is 0.00063 times 138.80 square miles.
(Washington, DC) (Immediate grounds size)
The grounds of United States Capitol, at the center of Washington DC's quadrants, consists of about seventeen buildings on a 0.089 square miles plot. While the Capitol Building is the central feature, other buildings include the Supreme Court Buildings and the Library of Congress Buildings, as well as several monuments and sculptures.