It's about 2,000 times as big as Fort Knox.
In other words, 500 feddans is 1,780 times the size of Fort Knox, and the size of Fort Knox is 0.000562 times that amount.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
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 0.281 feddans. 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.
It's about one-two-thousandth as big as Rhode Island.
In other words, 500 feddans is 0.000524886 times the size of Rhode Island, and the size of Rhode Island is 1,905.18 times that amount.(a.k.a. The State of Rhode Island and Providence Plantations, a.k.a. RI) (United States)
The "Ocean State," Rhode Island measures 952,587 feddans in total area. Several large bays totaling 644,158 feddans make up 32.4% of its total area.
It's about one-two-thousandth as big as Fort Bliss.
In other words, 500 feddans is 0.000464 times the size of Fort Bliss, and the size of Fort Bliss is 2,160 times that amount.(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 1,080,000 feddans. 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-two-thousand-five-hundredth as big as Grand Canyon National Park.
In other words, 500 feddans is 0.000425996914 times the size of Grand Canyon National Park, and the size of Grand Canyon National Park is 2,347.43485 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 1,173,717.21 feddans.
It's about one-two-thousand-five-hundredth as big as Anchorage.
In other words, 500 feddans is 0.0004134415 times the size of Anchorage, and the size of Anchorage is 2,418.722 times that amount.(formally the Municipality of Anchorage, a.k.a. MOA) (Alaska)
The fourth-largest city in Alaska and in the country, Anchorage measures 1,209,361 feddans in total area. The city is the home of a large energy industry, a hub for air and overseas cargo traffic, and home to nearly half of Alaska's population.
It's about one-two-thousand-five-hundredth as big as Prince Edward Island.
In other words, 500 feddans is 0.000369537 times the size of Prince Edward Island, and the size of Prince Edward Island is 2,706.09 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 1,353,040 feddans 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 one-three-thousandth as big as Delaware.
In other words, 500 feddans is 0.00032578842170121 times the size of Delaware, and the size of Delaware is 3,069.4767934912 times that amount.(United States)
The "First State," Delaware measures 1,534,738.4673468 feddans in total area. Its 19.3 km (12 mi) border with Pennsylvania, referred to as "Twelve-Mile Circle" is the only circular state boundary in the United States.