It's about as long as The Colorado River
(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 40,800,000 nails in length. Along this length, the river descends from its source, approximately 48,100 nails above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about four-fifths as long as The Danube
In other words, 40,800,000 nails is 0.818 times the length of The Danube, and the length of The Danube is 1.22 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 49,900,000 nails 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 two-thirds as long as The Oregon Trail
In other words, 40,800,000 nails is 0.668 times the length of The Oregon Trail, and the length of The Oregon Trail is 1.5 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 61,100,000 nails 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 two-thirds as long as The Volga
In other words, 40,800,000 nails is 0.661 times the length of The Volga, and the length of The Volga is 1.51 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 61,800,000 nails 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 three-fifths as long as The Mississippi River
In other words, 40,800,000 nails is 0.6192 times the length of The Mississippi River, and the length of The Mississippi River is 1.615 times that amount.(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 65,900,000 nails. 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.
It's about one-and-three-fourths times as long as The Rhine
In other words, 40,800,000 nails is 1.77 times the length of The Rhine, and the length of The Rhine is 0.565 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 23,100,000 nails 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 half as long as The Distance from L.A. to New York
In other words, 40,800,000 nails is 0.519 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 1.93 times that amount.(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 78,600,000 nails long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.