It's about 75 times as tall as a Mauna Loa.
In other words, 668 kilometers is 72.860 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.01372 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 75 times as tall as Mount Everest.
In other words, 668 kilometers is 75.50 times the height of Mount Everest, and the height of Mount Everest is 0.0132 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 95 times as tall as Aconcagua.
In other words, 668 kilometers is 95.9510 times the height of Aconcagua, and the height of Aconcagua is 0.010422 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 100 times as long as The Las Vegas Strip.
In other words, 668 kilometers is 98 times the length of The Las Vegas Strip, and the length of The Las Vegas Strip is 0.01 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 6.8 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 100 times as tall as Denali.
In other words, 668 kilometers is 107.90 times the height of Denali, and the height of Denali is 0.009268 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 6.1930 kilometers 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.
It's about 100 times as tall as Mount Logan.
In other words, 668 kilometers is 112.10 times the height of Mount Logan, and the height of Mount Logan is 0.008921 times that amount.(Kluane National Park and Reserve, Yukon, Canada) (elevation)
The highest mountain in Canada, Mount Logan has a total height of 5.960 kilometers. The high altitude and northern latitude of the mountain resulted in one-time temperature of -77.5 °C — the lowest temperature ever recorded outside of Antarctica.
It's about 100 times as tall as a Kilimanjaro.
In other words, 668 kilometers is 113.3970 times the height of a Kilimanjaro, and the height of a Kilimanjaro is 0.00881858 times that amount.(a.k.a. Mount Kilimanjaro) (Tanzania) (to Uhuru peak; 2008 gravimeter measurement)
Kilimanjaro rises to 5.890790 kilometers at its peak. An isolated peak with no surrounding mountain range, Kilimanjaro is considered the world's tallest freestanding mountain.