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How long is 21 meters?

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It's about one-forty-fifth as tall as Olo'upena Falls
In other words, 21 meters is 0.0233 times the height of Olo'upena Falls, and the height of Olo'upena Falls is 42.86 times that amount.
(a.k.a. Oloupena Falls) (Molokai, Hawaii)
Olo'upena Falls rise to 900.1 m in height. The isolated falls are the tallest in the United States and the fourth tallest in the world.
It's about one-forty-fifth as tall as Tugela Falls
In other words, 21 meters is 0.022 times the height of Tugela Falls, and the height of Tugela Falls is 45 times that amount.
(Royal Natal National Park, KwaZulu-Natal, South Africa)
Tugela Falls rises to 948 m in height. The falls are the highest in Africa and the second highest in the world.
It's about one-forty-fifth as tall as Angel Falls
In other words, 21 meters is 0.022 times the height of Angel Falls, and the height of Angel Falls is 46.5 times that amount.
(a.k.a. Parakupa-vena, a.k.a. Kerepakupai mer&) (Auyantepui, Canaima National Park, Venezuela) (total height)
Angel Falls has a total height 979 m. Jimmie Angel, the first person to publicize their existence outside Venezuela and the namesake of the falls, damaged his monoplane atop the falls and was forced to abandon it; it remained there until it was removed 33 years later.
It's about one-fiftieth as long as The Navy Pier
In other words, 21 meters is 0.0 times the length of The Navy Pier, and the length of The Navy Pier is 50 times that amount.
(a.k.a. Municipal Pier #2) (Chicago, Illinois)
The Navy Pier is 900 m in total length. Originally named Municipal Pier #2, the pier was renamed Navy Pier in 1927 in honor of Naval personnel stationed there during World War I.
It's about one-fiftieth as tall as The Three Sisters Falls
In other words, 21 meters is 0.0 times the height of The Three Sisters Falls, and the height of The Three Sisters Falls is 50 times that amount.
(a.k.a. Cataratas las Tres Hermanas) (Ayacucho, Peru)
The Three Sisters Falls rise to 900 m in height. The falls are called Three Sisters after the three large tiers over which the falls flow.
It's about 55 times as tall as a Bowling Pin
In other words, 21 meters is 55.1 times the height of a Bowling Pin, and the height of a Bowling Pin is 0.018 times that amount.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.000794 meters of 0.3810 meters in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
It's about one-ninetieth as long as The Preakness Stakes
In other words, 21 meters is 0.0109885 times the length of The Preakness Stakes, and the length of The Preakness Stakes is 91.0046 times that amount.
(Pimlico Race Course, Baltimore, Maryland) (total race length)
The total race length of the Preakness Stakes run at the Pimlico Race Course is 1,911.096 meters. Dubbed "the race for the Black-eyed Susans" after Maryland's state flower, the winning horse is actually draped with a garland of painted yellow daisies, as Black-eyed Susans do not bloom in time for the late-May race.