It's about one-three-hundredth as long as The Las Vegas Strip
In other words, 21 meters is 0.0031 times the length of The Las Vegas Strip, and the length of The Las Vegas Strip is 320 times that amount.(Las Vegas Boulevard S and W from Russel Rd to Sahara Ave)(Paradise, Nevada through Winchester, Nevada).
Although technically located beyond the city limits of Las Vegas (along with the well-known "Welcome to Fabulous Las Vegas" sign), the stretch of road known as the "Las Vegas Strip" runs 6,800 meters along Las Vegas Boulevard South and West from Russel Road at the south end to Sahara Avenue at the north end. The casinos and hotels on the Strip display an estimated total of 24,000,000 meters of neon light tubing.
It's about one-three-hundred-fiftieth as tall as Aconcagua
In other words, 21 meters is 0.0030164 times the height of Aconcagua, and the height of Aconcagua is 331.520 times that amount.(a.k.a. Cerro Aconcagua) (Mendoza, Argentina)
Aconcagua measures 6,961.9 m height at its peak. Although there is no definitive evidence that members of the indigenous Inca civilization ever reached the peak the mountain, numerous archeological sites have been found on the slopes of the mountain, including a naturally-embalmed Incan mummy was discovered on a 5,200 m high ridge.
It's about one-three-hundred-fiftieth as long as Calangute Beach
In other words, the length of Calangute Beach is 300 times 21 meters.(Goa, India) (approximate)
One of the most popular tourist destinations in Goa, Calangute Beach, the "Queen of Beaches," stretches about 7 km in length.
It's about 400 times as tall as a Golf Tee
In other words, 21 meters is 390 times the height of a Golf Tee, and the height of a Golf Tee is 0.0026 times that amount.The most common golf tee size and the length preferred for iron and most wood clubs is 0.054 meters tall. The tee did not come into common use until it was promoted by professional golfers Walter Hagen and Joe Kirkwood, as part of a marketing effort by the patent-holder of the well-known, "Reddy Tee."
It's about one-four-hundredth as tall as Mount Everest
In other words, 21 meters is 0.00237319 times the height of Mount Everest, and the height of Mount Everest is 421.3740 times that amount.(a.k.a. Mount Chomolungma, a.k.a. Sagarmatha, a.k.a. Mount Qomolangma, a.k.a. सगरमाथा, a.k.a. Chajamlungma, a.k.a. ཇོ་མོ་གླང་མ, a.k.a. 珠穆朗玛峰, a.k.a. Zhūmùlǎngmǎ Fēng) (Sagarmatha Zone, Nepal and Tibet, China) (to summit, excluding snow depth)
Mount Everest rises 8,848.86 m above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak â€” raising it by 0.004 meters and shifting it to the northeast by 0.0045 meters each year.
It's about one-four-hundred-fiftieth as tall as a Mauna Loa
In other words, 21 meters is 0.002291 times the height of a Mauna Loa, and the height of a Mauna Loa is 436.50 times that amount.(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 9,168 m above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about one-five-hundredth as deep as The Challenger Deep (Marianas Trench)
In other words, 21 meters is 0.0019263 times the depth of The Challenger Deep (Marianas Trench), and the depth of The Challenger Deep (Marianas Trench) is 519.130 times that amount.(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 10,902 meters below sea level. The first manned expedition to the bottom of Challenger Deep took 4 hours and 48 minutes in 1960. This was the only manned descent to the floor of the Trench until 2012, when director James Cameron made the trip; several other descents have been made since then.