It's about one-six-thousand-five-hundredth as long as The Grand Canyon
In other words, 68,500 milimeters is 0.000154 times the length of The Grand Canyon, and the length of The Grand Canyon is 6,490 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446,000,000 milimeters along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 1,100,000 milimeters above the floor of Granite Gorge.
It's about one-twenty-thousandth as long as The Rhine
In other words, 68,500 milimeters is 0.00005190 times the length of The Rhine, and the length of The Rhine is 19,300 times that amount.(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 1,320,000,000 milimeters in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about one-thirty-five-thousandth as long as The Colorado River
In other words, the length of The Colorado River is 34,000 times 68,500 milimeters.(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 2,330,000,000 milimeters in length. Along this length, the river descends from its source, approximately 2,750,000 milimeters above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about 40,000 times as wide as a Strand of Spaghetti
In other words, the width of a Strand of Spaghetti is 0.0000250 times 68,500 milimeters.(average; restaurant and supermarket applications) (based on FMA Omcan Italian Made TR50 Counter Top Pasta Machine Extruder 13317)
An average strand of restaurant-grade spaghetti measures 1.7 mm in thickness. In 2010, a California Buca di Beppo set a world record by preparing a 13,780-lb bowl of spaghetti, served in a swimming pool.
It's about one-forty-thousandth as long as The Danube
In other words, the length of The Danube is 41,700 times 68,500 milimeters.(a.k.a. Donau, a.k.a. Dunaj, a.k.a. Dunav, a.k.a. Duna, a.k.a. Дунав (Dunav), a.k.a. Dunărea, a.k.a. Дунáй (Dunay), a.k.a. Tuna) (from Breg Martinskapelle, Black Forest, Germany through the Danube Delta, Romania)
The Danube river runs 2,850,000,000 milimeters in total length. Intersecting Vienna, Austria; Bratislava, Slovakia; Budapest, Hungary; and Belgrade, Serbia, the Danube touches more capital cities than any other river.
It's about one-fifty-thousandth as long as The Oregon Trail
In other words, 68,500 milimeters is 0.00001960 times the length of The Oregon Trail, and the length of The Oregon Trail is 51,000 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 3,490,000,000 milimeters across five (sometimes six) states in the western United States. In the early years of the Trail's existence, the trip was estimated to have taken an average of 160 days.
It's about one-fifty-thousandth as long as The Volga
In other words, 68,500 milimeters is 0.00001940 times the length of The Volga, and the length of The Volga is 51,500 times that amount.(a.k.a. Волга, a.k.a. İdel (Идел), a.k.a. Атăл (Atăl), a.k.a. Edil, a.k.a. İdil, a.k.a. Рав (Rav)) (from the Valdai Hills, Tver Oblast, Russia through the Caspian Sea)
The largest river in Europe, the Volga river runs 3,530,000,000 milimeters in total length. World War II's Battle of Stalingrad between the Nazi Germany and the Soviet Union, which resulted in nearly two million casualties, was fought in part for control of the river.