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How long is 123 kilometers?

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It's about eleven times as tall as Maxwell Montes.
In other words, the height of Maxwell Montes is 0.091 times 123 kilometers.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 11 km. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.
It's about eleven-and-a-half times as tall as The Challenger Deep (Marianas Trench).
In other words, 123 kilometers is 11.2820 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.088637 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 km 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 thirteen-and-a-half times as tall as a Mauna Loa.
In other words, 123 kilometers is 13.420 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.07452 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 9.20 kilometers 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 fourteen times as tall as Mount Everest.
In other words, 123 kilometers is 13.90 times the height of Mount Everest, and the height of Mount Everest is 0.0719 times that amount.
(a.k.a. Mount Chomolungma, 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 8.850 kilometers above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak — raising it by 0.00000400 kilometers and shifting it to the northeast by 0.00000450 kilometers each year.
It's about seventeen-and-a-half times as tall as Aconcagua.
In other words, 123 kilometers is 17.6680 times the height of Aconcagua, and the height of Aconcagua is 0.0566 times that amount.
(a.k.a. Cerro Aconcagua) (Mendoza, Argentina)
Aconcagua measures 6.96190 kilometers 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 5.20 kilometers high ridge.
It's about eighteen times as long as The Las Vegas Strip.
In other words, the length of The Las Vegas Strip is 0.056 times 123 kilometers.
(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 6.8 km 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 km of neon light tubing.
It's about one-twentieth as long as The Colorado River.
In other words, 123 kilometers is 0.0528 times the length of The Colorado River, and the length of The Colorado River is 18.90 times that amount.
(a.k.a. Aha Kwahwat, a.k.a. Grand River, a.k.a. Tizon River, a.k.a. Tecon River, a.k.a. Tison River) (from Grand Lake, Colorado through the Gulf of California)
The Colorado River runs 2,330 km in length. Along this length, the river descends from its source, approximately 2.750 kilometers above sea level in the Rocky Mountains, to its mouth in the Gulf of California.