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How big is 138.80 square miles?

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It's about 4,000 times as big as Alcatraz
In other words, the size of Alcatraz is 0.00025 times 138.80 square miles.
(a.k.a. The Rock) (California)
Alcatraz Island measures 0.034 square miles. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about 4,500 times as big as Buckingham Palace
In other words, the size of Buckingham Palace is 0.00021 times 138.80 square miles.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 0.03 square miles of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about one-five-thousandth as big as Alaska
In other words, 138.80 square miles is 0.00020926708 times the size of Alaska, and the size of Alaska is 4,778.58250 times that amount.
(United States)
The "Last Frontier," Alaska measures 663,267.250 square miles in total area. Alaska is home to over 100,000 glaciers — half of the world's total — including the Bering Glacier complex near the southeastern border of Alaska, which covers 2,250.97560 square miles.
It's about 5,500 times as big as Croke Park
In other words, the size of Croke Park is 0.00018 times 138.80 square miles.
(a.k.a. Páirc an Chrócaigh) (Dublin, Leinster, Ireland) (stadium area)
Croke Park, the Gaelic games stadium of Dublin, hosts hurling and Gaelic football matches in a 0.025 square miles stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about 7,000 times as big as Windsor Castle
In other words, 138.80 square miles is 6,800 times the size of Windsor Castle, and the size of Windsor Castle is 0.00015 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 0.02 square miles. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about 7,000 times as big as Rogers Centre
In other words, 138.80 square miles is 6,990 times the size of Rogers Centre, and the size of Rogers Centre is 0.000143 times that amount.
(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 0.0198 square miles over the entire complex. The video board of Rogers Centre has a total area of 0.000131 square miles.
It's about 7,000 times as big as a Polo field
In other words, 138.80 square miles is 7,165.781330 times the size of a Polo field, and the size of a Polo field is 0.000139552123 times that amount.
(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 0.0193698347 square miles. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.