It's about 2,000 times as tall as The Challenger Deep (Marianas Trench)
In other words, 21,000,000 ells is 2,201.70 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.00045419 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 9,538.10 ells below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
It's about 2,500 times as tall as a Mauna Loa
In other words, 21,000,000 ells is 2,618 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.000382 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 8,049 ells 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 2,500 times as tall as Mount Everest
In other words, 21,000,000 ells is 2,710 times the height of Mount Everest, and the height of Mount Everest is 0.000369 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 is 7,740 ells above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak â€” raising it by 0.0035 ells and shifting it to the northeast by 0.00394 ells each year.
It's about 3,000 times as long as Calangute Beach
In other words, the length of Calangute Beach is 0.0003 times 21,000,000 ells.(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 3,500 times as tall as Aconcagua
In other words, 21,000,000 ells is 3,447.80 times the height of Aconcagua, and the height of Aconcagua is 0.00029004 times that amount.(a.k.a. Cerro Aconcagua) (Mendoza, Argentina)
Aconcagua measures 6,090.90 ells 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 4,549.40 ells high ridge.
It's about 3,500 times as long as The Las Vegas Strip
In other words, the length of The Las Vegas Strip is 0.00029 times 21,000,000 ells.(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 5,900 ells 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 21,000,000 ells of neon light tubing.
It's about 4,000 times as tall as Denali
In other words, 21,000,000 ells is 3,876 times the height of Denali, and the height of Denali is 0.000258 times that amount.(a.k.a. Mount McKinley, a.k.a. Doleika, a.k.a. Traleika, a.k.a. "The Great One") (Denali National Park and Preserve, Alaska) (South peak)
The highest mountain peak in North America, Denali's South Peak measures 5,418 ells above sea level at its peak. The impetus for the name Mount McKinley was US president William McKinley of Ohio, and disputes over the which of the mountain's names should be officially recognized regularly occur between Ohio Congressmen and Alaska politicians.