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How big is 138.80 square miles?

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It's about 40 times as big as Sydney Kingsford Smith Airport (SYD)
In other words, the size of Sydney Kingsford Smith Airport (SYD) is 0.03 times 138.80 square miles.
(a.k.a. Mascot Airport, a.k.a. Kingsford Smith Airport, a.k.a. Sydney Airport) (Sydney, New South Wales, Australia) (total site area)
Sydney Kingston Smith Airport covers a total area of about 3 square miles, including three main terminals. The airport offers 8,930 m of total runway length.
It's about one-forty-fifth as big as Brisbane
In other words, 138.80 square miles is 0.022692 times the size of Brisbane, and the size of Brisbane is 44.068 times that amount.
(Greater Brisbane region) (Australia)
Brisbane, the most populous city in Australia, measures 6,116.60 square miles. Winding through the city is the Brisbane River, which is lined by the 870 m Bisbane Riverwalk.
It's about one-fifty-fifth as big as Lake Ontario
In other words, 138.80 square miles is 0.01896 times the size of Lake Ontario, and the size of Lake Ontario is 52.740 times that amount.
(a.k.a. Lac Ontario) (surface area)
The smallest of North America's Great Lakes (by surface area), Lake Ontario has a total area of 7,320 square miles. It borders the cities of Toronto, Ontario, Canada and Rochester, New York.
It's about 55 times as big as London-Gatwick Airport (LGW)
In other words, 138.80 square miles is 53.30 times the size of London-Gatwick Airport (LGW), and the size of London-Gatwick Airport (LGW) is 0.0188 times that amount.
(a.k.a. Gatwick Airport, a.k.a. London Gatwick) (Crawley, West Sussex, England, United Kingdom)
London-Gatwick Airport covers 2.60 square miles in total area. The airport offers a single runway with a total length of 3,316 m.
It's about 55 times as big as Gibraltar
In other words, the size of Gibraltar is 0.018 times 138.80 square miles.
(British overseas territory) (total area)
The British overseas territory Gibraltar is located at the southern tip of Spain overlooking the Mediterranean Sea at the Strait of Gibraltar and measures of 2.50 square miles in total area. It is renowned as the home of the Rock of Gibraltar (a.k.a. Calpe, a.k.a. Jabal al Tariq), a well-known tourist attraction.
It's about one-sixtieth as big as Wales
In other words, 138.80 square miles is 0.01734 times the size of Wales, and the size of Wales is 57.670 times that amount.
(a.k.a. Cymru) (total area)
The area of the country of Wales (in the United Kingdom) is 8,004.70 square miles. More than 295.250 square miles, or about 4% of the country's land area, is made up of the fifty-plus islands in the Irish and Celtic Seas off the coast of the Welsh mainland.
It's about 65 times as big as Chennai International Airport (MAA)
In other words, 138.80 square miles is 67.140 times the size of Chennai International Airport (MAA), and the size of Chennai International Airport (MAA) is 0.01489 times that amount.
(f.k.a. Madras Airport) (Chennai City, Tamil Nadu, India) (total land area)
Chennai International Airport covers a total area of about 2.067 square miles, including four terminals and other outbuildings. The airport offers a total of 6,587 m runway length between its two main runways.