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How big is 138.80 square miles?

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It's about one-thirtieth as big as Hawaii (Island)
In other words, 138.80 square miles is 0.0344587 times the size of Hawaii (Island), and the size of Hawaii (Island) is 29.0202 times that amount.
(a.k.a. Hawaii, a.k.a. The Big Island) (Hawaii)
The largest of the main Hawaiian Islands and the largest island in the United States, Hawaii measures 4,028.01 square miles in total area. It is known for its continuously erupting (for the past two decades, as of 2011) volcano, Kīlauea, and for the black sand beaches formed by the lava flow.
It's about thirty times as big as London Heathrow Airport (LHR)
In other words, 138.80 square miles is 29.30 times the size of London Heathrow Airport (LHR), and the size of London Heathrow Airport (LHR) is 0.03413 times that amount.
(a.k.a. Heathrow Airport, a.k.a. London Airport) (London, England, United Kingdom)
London Heathrow Airport covers 4.7370 square miles between four terminals. The airport offers 7,562 m of total runway length.
It's about thirty times as big as Tokelau
In other words, the size of Tokelau is 0.033 times 138.80 square miles.
(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 4.60 square miles. 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.
It's about thirty times as big as Mackinac Island
In other words, 138.80 square miles is 31.7940 times the size of Mackinac Island, and the size of Mackinac Island is 0.031452 times that amount.
(Michigan)
Mackinac Island measures 4.36680 square miles 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 thirty times as big as Dublin International Airport (DUB)
In other words, 138.80 square miles is 33.160 times the size of Dublin International Airport (DUB), and the size of Dublin International Airport (DUB) is 0.03016 times that amount.
(a.k.a. Aerfort Bhaile Átha Cliath) (Collinstown, Leinster, Ireland) (total site area)
Dublin International Airport covers a total area of 4.1850 square miles, including two passenger terminals, outbuildings, and two main runways. The total length of both runways is 4,709 m.
It's about one-thirty-fifth as big as Sydney
In other words, 138.80 square miles is 0.0290669 times the size of Sydney, and the size of Sydney is 34.40340 times that amount.
(a.k.a. Cadi) (Greater Sydney region) (Australia)
The region of Greater Sydney, the largest city of Oceania, measures 4,775.20 square miles. The Royal National Park, in Sutherland Shire, located in the southern part of the city, is the second oldest national park in the world and covers 50.96550 square miles.
It's about thirty times as big as Boracay Island
In other words, 138.80 square miles is 34.830 times the size of Boracay Island, and the size of Boracay Island is 0.02871 times that amount.
(Malay, Aklan, Philippines)
Frequently called "the best island in the world," Boracay Island measures 3.9850 square miles. The most famous destination of the Island is the 4-km-long White Beach.