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How big is 18,618,000 square kilometers?

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It's about thirty times as big as Texas
In other words, 18,618,000 square kilometers is 26.7645690 times the size of Texas, and the size of Texas is 0.037362828 times that amount.
(United States)
The "Lone Star State," Texas measures 695,621.13 sq. km in total area. Texas covers so much area that Texarkana — a city in the state's northeastern corner — is about 30 km closer to Chicago, Illinois, than it is to El Paso — in the western corner of Texas.
It's about 45 times as big as California
In other words, 18,618,000 square kilometers is 43.9135280 times the size of California, and the size of California is 0.022772026 times that amount.
(United States)
The "Golden State," California measures 423,969.58 sq. km in total area. California is home to both the highest point — Mt. Whitney at 4,421 m (14,505 ft) — and lowest point — Death Valley at 85.5 m (282 ft) below sea level — in the continental United States, the two of which are separated by just 123 km (76 mi).
It's about 50 times as big as Montana
In other words, 18,618,000 square kilometers is 48.8869190 times the size of Montana, and the size of Montana is 0.02045537 times that amount.
(United States)
The "Treasure State," Montana measures 380,838.07 sq. km in total area. The northwest corner of Montana is home to Flathead Lake, the largest freshwater lake in the continental United States with a surface area of 496 sq. km.
It's about 55 times as big as The Great Barrier Reef
In other words, 18,618,000 square kilometers is 53.50 times the size of The Great Barrier Reef, and the size of The Great Barrier Reef is 0.0187 times that amount.
(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 348,000 sq. km. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.
It's about 75 times as big as Michigan
In other words, 18,618,000 square kilometers is 74.325250 times the size of Michigan, and the size of Michigan is 0.01345438 times that amount.
(United States)
The "Great Lakes State," Michigan measures 250,493.6 sq. m in total area. According to some studies, there is no point in Michigan that is more than 9.66 km (6 mi) from a lake or 136.79 km (85 mi) from a Great Lake.
It's about 85 times as big as Minnesota
In other words, 18,618,000 square kilometers is 82.683970 times the size of Minnesota, and the size of Minnesota is 0.01209424 times that amount.
(United States)
The "North Star State," Minnesota measures 225,170.6 sq. km in total area. Due to an error in the map used while writing the Treaty of Paris, a 1,544.5 sq. km (596.3 sq. mi) segment of Minnesota called the "Northwest Angle" lies north of the 49th parallel, which marks the border between the contiguous United States and Canada across the western remainder of the two countries.
It's about 85 times as big as Kansas
In other words, 18,618,000 square kilometers is 87.36910 times the size of Kansas, and the size of Kansas is 0.0114457 times that amount.
(United States)
The "Sunflower State," Kansas measures 213,096.0 sq. km in total area. The point said to be the geographic center of the continental United States is located near Lebanon, Kansas.