It's about 300 times as deep as The Challenger Deep (Marianas Trench)
In other words, 623 leagues is 317.5 times the depth of The Challenger Deep (Marianas Trench), and the depth of The Challenger Deep (Marianas Trench) is 0.003150 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 1.96220 leagues 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.
It's about 400 times as tall as a Mauna Loa
In other words, 623 leagues is 377.6 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.00265 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 1.6560 leagues 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 400 times as tall as Mount Everest
In other words, 623 leagues is 391.168 times the height of Mount Everest, and the height of Mount Everest is 0.0025565 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 1.592670 leagues above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak â€” raising it by 0.0000007199420 leagues and shifting it to the northeast by 0.0000008099350 leagues each year.
It's about 500 times as tall as Aconcagua
In other words, 623 leagues is 497.19 times the height of Aconcagua, and the height of Aconcagua is 0.002011 times that amount.(a.k.a. Cerro Aconcagua) (Mendoza, Argentina)
Aconcagua measures 1.2530 leagues 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 0.935930 leagues high ridge.
It's about 500 times as long as Calangute Beach
In other words, 623 leagues is 500 times the length of Calangute Beach, and the length of Calangute Beach is 0.00 times that amount.(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 500 times as long as The Las Vegas Strip
In other words, 623 leagues is 510 times the length of The Las Vegas Strip, and the length of The Las Vegas Strip is 0.00 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 1.20 leagues 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 4,300 leagues of neon light tubing.
It's about 550 times as tall as Denali
In other words, 623 leagues is 558.9 times the height of Denali, and the height of Denali is 0.00179 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 1.1150 leagues 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.