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How long is 138 feet?

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It's about one-thirty-thousandth as long as The Rhine.
In other words, 138 feet is 0.00003190 times the length of The Rhine, and the length of The Rhine is 31,300 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 4,330,000 feet 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 35,000 times as long as a Grain of Sand.
In other words, 138 feet is 33,600 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.00002980 times that amount.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.0041 feet. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 49.50 feet in height.
It's about one-fifty-five-thousandth as long as The Colorado River.
In other words, the length of The Colorado River is 55,200 times 138 feet.
(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 7,640,000 feet in length. Along this length, the river descends from its source, approximately 9,020 feet above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about one-seventy-thousandth as long as The Danube.
In other words, 138 feet is 0.00001480 times the length of The Danube, and the length of The Danube is 67,600 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 9,350,000 feet 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-eighty-five-thousandth as long as The Oregon Trail.
In other words, the length of The Oregon Trail is 82,600 times 138 feet.
(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 11,500,000 feet 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-eighty-five-thousandth as long as The Volga.
In other words, the length of The Volga is 84,000 times 138 feet.
(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 11,600,000 feet 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 one-ninety-thousandth as long as The Mississippi River.
In other words, 138 feet is 0.000011170 times the length of The Mississippi River, and the length of The Mississippi River is 89,530 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 12,360,000 feet. 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.