It's about two-thirds as tall as a Kilimanjaro
In other words, 4 kilometers is 0.6790260 times the height of a Kilimanjaro, and the height of a Kilimanjaro is 1.47270 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.
It's about two-thirds as tall as Mount Logan
In other words, 4 kilometers is 0.67130 times the height of Mount Logan, and the height of Mount Logan is 1.490 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 two-thirds as tall as Denali
In other words, 4 kilometers is 0.64590 times the height of Denali, and the height of Denali is 1.5480 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 one-and-three-fifths times as long as Steel Dragon 2000
In other words, 4 kilometers is 1.6140 times the length of Steel Dragon 2000, and the length of Steel Dragon 2000 is 0.61960 times that amount.(a.k.a. スチールドラゴン2000) (Nagashima Span Land; Kuwana, Mie Prefecture, Japan)
The roller coaster Steel Dragon 2000 is 2.4790 kilometers in length. It is one of only two operating "Gigacoasters" (meaning its height is between 0.09144 kilometers and 0.12160 kilometers) in the world, having a height of 0.097 kilometers.
It's about one-and-two-thirds times as long as The Belmont Stakes
In other words, 4 kilometers is 1.656990 times the length of The Belmont Stakes, and the length of The Belmont Stakes is 0.60350390 times that amount.(Belmont Park, Elmont, New York) (total race length)
The total race length of the Belmont Stakes run at Belmont Park is 2.4140160 kilometers. It was during the 1974 Belmont Stakes that Secretariat set an America Grade 1 stakes record in winning by a distance of about 0.0755904 kilometers
It's about three-fifths as long as Calangute Beach
In other words, the length of Calangute Beach is 2 times 4 kilometers.(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 three-fifths as long as The Las Vegas Strip
In other words, 4 kilometers is 0.590 times the length of The Las Vegas Strip, and the length of The Las Vegas Strip is 1.70 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.