It's about 0.00000009 times as long as Hadrian's Wall.
In other words, 0.40 inches is 0.0000000850 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 12,000,000 times that amount.(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 4,700,000 inches (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about 0.00000003 times as long as The Grand Canyon.
In other words, 0.40 inches is 0.00000002280 times the length of The Grand Canyon, and the length of The Grand Canyon is 43,900,000 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 17,600,000 inches 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 43,300 inches above the floor of Granite Gorge.
It's about 0.000000008 times as long as The Rhine.
In other words, 0.40 inches is 0.00000000770 times the length of The Rhine, and the length of The Rhine is 130,000,000 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 52,000,000 inches 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 0.000000005 times as long as The Colorado River.
In other words, 0.40 inches is 0.000000004360 times the length of The Colorado River, and the length of The Colorado River is 229,000,000 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 91,700,000 inches in length. Along this length, the river descends from its source, approximately 108,000 inches above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about 0.000000004 times as long as The Danube.
In other words, 0.40 inches is 0.000000003560 times the length of The Danube, and the length of The Danube is 281,000,000 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 112,000,000 inches 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 0.000000003 times as long as The Oregon Trail.
In other words, 0.40 inches is 0.000000002910 times the length of The Oregon Trail, and the length of The Oregon Trail is 344,000,000 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 137,000,000 inches 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 0.000000003 times as long as The Volga.
In other words, 0.40 inches is 0.000000002880 times the length of The Volga, and the length of The Volga is 347,000,000 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 139,000,000 inches 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.