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How big is 28 square miles?

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It's about one-and-one-fifth times as big as San Marino.
In other words, the size of San Marino is 0.830 times 28 square miles.
(a.k.a. The Most Serene Republic of San Marino, a.k.a. Serenissima Repubblica di San Marino)
an Marino is an enclave country located within the Apennine Mountains in Italy, with a total area of 24 square miles. Established in 301 CE, San Marino is the oldest sovereign state in the world.
It's about seven-tenths as big as Disney World.
In other words, 28 square miles is 0.7180 times the size of Disney World, and the size of Disney World is 1.390 times that amount.
(a.k.a. Walk Disney World Resort, a.k.a. Walt Disney World, a.k.a. WDW) (Lake Buena Vista and Bay Lake, Florida) (total site)
Disney World currently occupies 39 square miles. Part of the former total area of 46.30 square miles now comprises the Disney planned community of Celebration, Florida.
It's about one-and-a-half times as big as The Pitcairn Islands.
In other words, the size of The Pitcairn Islands is 0.670 times 28 square miles.
(a.k.a. Pitcairn, Henderson, Ducie and Oeno Islands, a.k.a. Pitkern Ailen) (British overseas territory) (total land area)
The Pitcairn Islands are a group of four islands which have a combined area of 18 square miles. A British overseas territory since 1838, the island is populated by the descendents of mutineers and others who traveled on the British Royal Naval Ship, HMS Bounty during her 1789-1790 voyage.
It's about two-thirds as big as Hilton Head.
In other words, 28 square miles is 0.6661610 times the size of Hilton Head, and the size of Hilton Head is 1.501140 times that amount.
(a.k.a. Hilton Head Island) (South Carolina)
Hilton Head Island measures 42.0311 square miles in total land area. The island (and city of the same name) is located in the Atlantic Ocean and is known as popular vacation destination.
It's about one-and-four-fifths times as big as Rock Island.
In other words, 28 square miles is 1.84890 times the size of Rock Island, and the size of Rock Island is 0.540860 times that amount.
(a.k.a. Arsenal Island, a.k.a. Rock Island Arsenal) (Illinois, on the Iowa border) (land area only)
Rock Island measures 15.1430 square miles in total area. It is known as the largest government-owned weapons manufacturing arsenal in the United States and the US Army's only active foundry, as well as a former Union prison camp during the American Civil War.
It's about two-fifths as big as Washington, D.C..
In other words, 28 square miles is 0.410 times the size of Washington, D.C., and the size of Washington, D.C. is 2.440 times that amount.
(formally the District of Columbia, a.k.a. Washington, a.k.a. the District, a.k.a. DC) (United State)
The United States' capital and only federal district, Washington, D.C. is a 68.30 square miles area located between the states of Virginia and Maryland. Washington, D.C. is known as the center of each of the three branches of the United States federal government and as home to many of the nation's monuments, museums, and foreign embassies.
It's about two-fifths as big as Carlsbad Caverns National Park.
In other words, 28 square miles is 0.383170 times the size of Carlsbad Caverns National Park, and the size of Carlsbad Caverns National Park is 2.60980 times that amount.
(a.k.a. Carlsbad Caverns National Park) (Eddy County, New Mexico)
The home of the Carlsbad Caverns cave system, the national park of the same name occupies 73.074 square miles. James Larkin White, a 19th-century cowboy, explorer, and eventual park ranger discovered the cave and named many of its caverns when he was just sixteen years old.