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How big is 400 city blocks?

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It's about as big as Sydney Kingsford Smith Airport (SYD)
(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 400 city blocks, including three main terminals. The airport offers 8,930 m of total runway length.
It's about four-fifths as big as Boracay Island
In other words, 400 city blocks is 0.8414 times the size of Boracay Island, and the size of Boracay Island is 1.188 times that amount.
(Malay, Aklan, Philippines)
Frequently called "the best island in the world," Boracay Island measures 475.40 city blocks. The most famous destination of the Island is the 4-km-long White Beach.
It's about four-fifths as big as Dublin International Airport (DUB)
In other words, 400 city blocks is 0.801 times the size of Dublin International Airport (DUB), and the size of Dublin International Airport (DUB) is 1.248 times that amount.
(a.k.a. Aerfort Bhaile Átha Cliath) (Collinstown, Leinster, Ireland) (total site area)
Dublin International Airport covers a total area of 499.40 city blocks, including two passenger terminals, outbuildings, and two main runways. The total length of both runways is 4,709 m.
It's about one-and-three-tenths times as big as London-Gatwick Airport (LGW)
In other words, 400 city blocks is 1.29 times the size of London-Gatwick Airport (LGW), and the size of London-Gatwick Airport (LGW) is 0.775 times that amount.
(a.k.a. Gatwick Airport, a.k.a. London Gatwick) (Crawley, West Sussex, England, United Kingdom)
London-Gatwick Airport covers 310 city blocks in total area. The airport offers a single runway with a total length of 3,316 m.
It's about one-and-three-tenths times as big as Gibraltar
In other words, 400 city blocks is 1.3 times the size of Gibraltar, and the size of Gibraltar is 0.77 times that amount.
(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 300 city blocks 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 three-fourths as big as Mackinac Island
In other words, 400 city blocks is 0.76795 times the size of Mackinac Island, and the size of Mackinac Island is 1.3022 times that amount.
(Michigan)
Mackinac Island measures 521.01 city blocks in total land area. The island is located in Lake Huron and is known as a historically-cultured tourist destination and summer colony, home to the well-known Victorian Grand Hotel.
It's about seven-tenths as big as Tokelau
In other words, 400 city blocks is 0.72 times the size of Tokelau, and the size of Tokelau is 1.4 times that amount.
(a.k.a. Tokelau Islands, a.k.a. The Union Islands) (New Zealand Territory) (total area)
Tokelau, a territory consisting of three coral atolls under the sovereignty of New Zealand, measures 550 city blocks. With exports consisting of small crafts and small-scale agriculture, most of which is traded only with New Zealand, Tokelau has the smallest economy of any country in the world.