It's about 800,000 times as long as a Mitochondrion.
In other words, 1,500,000 microns is 798,000 times the length of a Mitochondrion, and the length of a Mitochondrion is 0.000001250 times that amount.(Eukaryotic; average)
A mitochondrion measures between 0.75 and 3 micrometers (Âµm). The mitochondrion is commonly referred to as the powerhouse of the cell, responsible for the generation of ATP. The size, shape, and distribution of mitochondria varies widely, with human liver cells each having 1,000 to 2,000 mitochondria.
It's about one-nine-hundred-thousandth as long as The Rhine.
In other words, 1,500,000 microns is 0.000001140 times the length of The Rhine, and the length of The Rhine is 877,000 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 1,320,000,000,000 microns 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 0.0000007 times as long as The Colorado River.
In other words, 1,500,000 microns is 0.0000006440 times the length of The Colorado River, and the length of The Colorado River is 1,550,000 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 2,330,000,000,000 microns in length. Along this length, the river descends from its source, approximately 2,750,000,000 microns above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about 0.0000006 times as long as The Danube.
In other words, 1,500,000 microns is 0.0000005260 times the length of The Danube, and the length of The Danube is 1,900,000 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 2,850,000,000,000 microns 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 0.0000005 times as long as The Oregon Trail.
In other words, 1,500,000 microns is 0.000000430 times the length of The Oregon Trail, and the length of The Oregon Trail is 2,330,000 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 3,490,000,000,000 microns 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 0.0000005 times as long as The Volga.
In other words, 1,500,000 microns is 0.0000004250 times the length of The Volga, and the length of The Volga is 2,350,000 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 3,530,000,000,000 microns 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 0.0000004 times as long as The Mississippi River.
In other words, 1,500,000 microns is 0.00000039830 times the length of The Mississippi River, and the length of The Mississippi River is 2,511,000 times that amount.(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 3,766,000,000,000 microns. 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.