How big is 55 square kilometers?

Seal Island, named for the tens of thousands of Cape Fur Seals that live there, measures about 0.0081 square kilometers. The large number seals attract great white sharks, who circle the island in a so-called "Ring of Death."

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.

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).

Housing the presidency, the White House occupies six stories and a total of 0.0062 square kilometers of floor space. This space includes 132 rooms, 35 bathrooms, 28 fireplaces, and 3 elevators, as well as a tennis court, bowling alley, movie theater, jogging track, swimming pool, and putting green.

Per NFL rules, a football field should measure 109.728 m (120 yards) long by 48.768 m wide, for a total area of 0.005351215104 square kilometers. Due to a blizzard, the first NFL playoff game in 1932 was held indoors in Chicago Stadium (it was also the first indoor game) on a field measuring just 55 m by 40.0 m, for a total area of 0.0022 square kilometers.

One of the largest homes in the world, Bill and Melinda Gates' home has a total area of 0.004474 square kilometers, including 7 bedrooms, 24 bathrooms, 6 kitchens, 6 fireplaces, a 0.00023 square kilometers gym, a 0.0000900 square kilometers dining room, and a 0.00019 square kilometers library. It was designed by Bohlin Cywinski Jackson, the same architectural firm responsible for the design of one of Apple Inc's flagship stores on Fifth Avenue in New York City.

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.

The "Last Frontier," Alaska measures 1,717,854.3 sq. km in total area. Alaska is home to over 100,000 glaciers — half of the world's total — including the Bering Glacier complex near the southeastern border of Alaska, which covers 5,830 sq. km.

Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 0.00151682874 square kilometers. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.

Manchester Cathedral includes a total interior area of 0.001238 square kilometers between the Nave, Chapel, Library, Chapter House, and Rectory. The height of the Cathedral's bell tower is 41.1 m.

The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 0.00118 square kilometers. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.

Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 0.0004956377184 square kilometers. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.

Brazil measures 8,514,877 sq. km in total area. Brazil is the world's fifth-largest country by area and eighth-largest economy (by GDP).

An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.0003542 square kilometers. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).

Mainland China, as measured by the United Nations (excluding China's Special Administrative Regions — Hong Kong and Macau — and disputed territories such as Taiwan, Askai Chin, and the Trans-Karakoram Tract), occupies 9,596,961 sq. km in total area . China is the the most populous country in the world and the third or fourth largest (depending on areas included in the measurement) in total area.