It's about three-fifths as tall as Aconcagua
In other words, 4 kilometers is 0.574560 times the height of Aconcagua, and the height of Aconcagua is 1.74050 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 one-and-four-fifths times as long as The Beast (Roller Coaster)
In other words, 4 kilometers is 1.7830 times the length of The Beast (Roller Coaster), and the length of The Beast (Roller Coaster) is 0.56090 times that amount.(King's Island Amusement Park; Mason, OH)
The roller coaster The Beast is 2.2430 kilometers in length. On its twenty-fifth year of operation in 2004, The Beast was awarded the Landmark Award by the American Coaster Enthusiasts as a historically significant roller coaster.
It's about twice as long as The Kentucky Derby
In other words, 4 kilometers is 1.988390 times the length of The Kentucky Derby, and the length of The Kentucky Derby is 0.5029190 times that amount.(Churchill Downs, Louisville, Kentucky) (total race length)
The total race length of the Kentucky Derby run at Churchill Downs is 2.01168 kilometers. First run in 1864, the Kentucky Derby is one of the oldest continuously-running sporting events in America, almost two years older than the Westminster Kennel Club Dog Show
It's about two times as long as The Preakness Stakes
In other words, 4 kilometers is 2.09304 times the length of The Preakness Stakes, and the length of The Preakness Stakes is 0.4777740 times that amount.(Pimlico Race Course, Baltimore, Maryland) (total race length)
The total race length of the Preakness Stakes run at the Pimlico Race Course is 1.9110960 kilometers. Dubbed "the race for the Black-eyed Susans" after Maryland's state flower, the winning horse is actually draped with a garland of painted yellow daisies, as Black-eyed Susans do not bloom in time for the late-May race.
It's about half as tall as Mount Everest
In other words, 4 kilometers is 0.4520360 times the height of Mount Everest, and the height of Mount Everest is 2.212210 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 8.848860 kilometers above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak â€” raising it by 0.00000400 kilometers and shifting it to the northeast by 0.00000450 kilometers each year.
It's about two-fifths as tall as a Mauna Loa
In other words, 4 kilometers is 0.43630 times the height of a Mauna Loa, and the height of a Mauna Loa is 2.2920 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 two-fifths as deep as The Challenger Deep (Marianas Trench)
In other words, 4 kilometers is 0.366910 times the depth of The Challenger Deep (Marianas Trench), and the depth of The Challenger Deep (Marianas Trench) is 2.72550 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. 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.