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How big is 138.80 square miles?

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It's about one-tenth as big as Kangaroo Island
In other words, 138.80 square miles is 0.08161 times the size of Kangaroo Island, and the size of Kangaroo Island is 12.250 times that amount.
(a.k.a. Karta) (state of South Australia, Australia)
Kangaroo Island, off the southern coast of Australia, measures 1,701 square miles in total area. The island is famous for its ligurian bee colonies, exporting over 100 tonnes of honey each year.
It's about one-fifteenth as big as Fort Bliss
In other words, the size of Fort Bliss is 12.60 times 138.80 square miles.
(near Las Cruces, New Mexico and El Paso, Texas)
Fort Bliss is the United States Army's second-largest installation with a total area of 1,750 square miles. It is known as the largest TRADOC (Training and Doctrine Command) site, the Army's largest maneuver area, and the country's largest contiguous tract of open airspace.
It's about one-fifteenth as big as Grand Canyon National Park
In other words, 138.80 square miles is 0.0729101965 times the size of Grand Canyon National Park, and the size of Grand Canyon National Park is 13.71550270 times that amount.
(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)
Containing the 446 km (277 mi) Grand Canyon gorge, Grand Canyon National Park covers 1,903.711440 square miles.
It's about fourteen times as big as Tuvalu
In other words, the size of Tuvalu is 0.071 times 138.80 square miles.
(a.k.a. Ellice Islands)
Tuvalu is a chain of islands totaling 10 square miles in area and located midway between Hawaii and Australia, near Samoa and Fiji. It is the third-least populated nation in the world, with just 11,992 citizens and residents.
It's about one-fifteenth as big as Calgary
In other words, 138.80 square miles is 0.0703475 times the size of Calgary, and the size of Calgary is 14.21510 times that amount.
(Calgary metro) (Canada)
One of the largest cities in Canada, Calgary measures 1,973.06 square miles. Calgary has a large parks system, with 800 km of pathways connecting the city's various parks.
It's about one-fifteenth as big as Prince Edward Island
In other words, 138.80 square miles is 0.063247 times the size of Prince Edward Island, and the size of Prince Edward Island is 15.8110 times that amount.
(a.k.a. PEI, a.k.a. P.E.I., a.k.a. Île-du-Prince-Édouard, a.k.a. Eilean a' Phrionnsa, a.k.a. Garden of the Gulf, a.k.a. Birthplace of the Confederation, a.k.a. Île Saint-Jean)
Prince Edward Island, located off Canada's eastern coast in the Gulf of St. Lawrence, measures 2,194.570 square miles in total area. Significant among Prince Edward Island's industries is agriculture, with the island producing 1.3 billion kg (1.4 million tons) of potatoes each year — almost 21% the output of the US state of Idaho with 3% as much land.
It's about seventeen times as big as Nauru
In other words, the size of Nauru is 0.059 times 138.80 square miles.
(a.k.a. Republic of Nauru, a.k.a. Pleasant Island)
The world's smallest island nation, Nauru is a Micronesian island with a total area of 8.10 square miles. Once a prosperous phosphate mining nation with the highest per-capita income of any nation, today 90% of the population is unemployed.