It's about 10,000 times as big as Ellis Island.
In other words, 1,230,000 dunams is 11,100 times the size of Ellis Island, and the size of Ellis Island is 0.00009010 times that amount.(Jersey City, New Jersey and New York City, New York)(now officially part of the Statue of Liberty National Monument)
Ellis Island, home of the Ellis Island Immigration Station, is 111 dunams in total area. Nine-tenths of the island were artificially created after the New York-New Jersey borders had already been defined, leading to a sovereignty dispute which was settled by the US Supreme Court in 1998.
It's about one-fifteen-thousandth as big as Russia.
In other words, 1,230,000 dunams is 0.000071937220 times the size of Russia, and the size of Russia is 13,901.01 times that amount.(a.k.a Российская Федерация, formally the Russian Federation, a.k.a. Россия)
The largest country in the world, Russia measures 17,098,242,000 dunams. Russia spans eleven time zones and holds more forest than any other country in the world, as well as lakes and rivers containing totaling 25% of the world's fresh water supply.
It's about 15,000 times as big as Alcatraz.
In other words, the size of Alcatraz is 0.0000710 times 1,230,000 dunams.(a.k.a. The Rock) (California)
Alcatraz Island measures 89 dunams. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about 15,000 times as big as Buckingham Palace.
In other words, the size of Buckingham Palace is 0.0000630 times 1,230,000 dunams.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 77 dunams of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about 25,000 times as big as Windsor Castle.
In other words, the size of Windsor Castle is 0.0000430 times 1,230,000 dunams.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53 dunams. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about 25,000 times as big as a Polo field.
In other words, 1,230,000 dunams is 24,517.79590 times the size of a Polo field, and the size of a Polo field is 0.00004078670060 times that amount.(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 50.16764160 dunams. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about 40,000 times as big as The Lincoln Memorial Reflecting Pool.
In other words, 1,230,000 dunams is 39,000 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 0.00002560 times that amount.(Washington, D.C.) (pool surface area)
The Lincoln Memorial Reflecting Pool has a water surface area of 31.50 dunams. The Pool has a sloping bottom and extends to 80 cm (30 in) in depth at its center.