It's about 0.0000008 times as long as The Grand Canyon.
In other words, 351 milimeters is 0.0000007870 times the length of The Grand Canyon, and the length of The Grand Canyon is 1,270,000 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 0.0000003 times as long as The Rhine.
In other words, 351 milimeters is 0.0000002660 times the length of The Rhine, and the length of The Rhine is 3,760,000 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 0.0000002 times as long as The Colorado River.
In other words, 351 milimeters is 0.0000001510 times the length of The Colorado River, and the length of The Colorado River is 6,620,000 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 2,330,000,000 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 0.0000001 times as long as The Danube.
In other words, 351 milimeters is 0.0000001230 times the length of The Danube, and the length of The Danube is 8,130,000 times that amount.(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 0.0000001 times as long as The Oregon Trail.
In other words, 351 milimeters is 0.0000001010 times the length of The Oregon Trail, and the length of The Oregon Trail is 9,900,000 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 0.00000010 times as long as The Volga.
In other words, 351 milimeters is 0.00000009940 times the length of The Volga, and the length of The Volga is 10,100,000 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.
It's about 0.00000010 times as long as The Mississippi River.
In other words, 351 milimeters is 0.00000009320 times the length of The Mississippi River, and the length of The Mississippi River is 10,730,000 times that amount.(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 3,766,000,000 milimeters. Prior to the development of soil erosion programs, the Mississippi River would carry approximately 400 million metric tons of sediment from its banks to the Gulf of Mexico every year.