It's about 0.000000001 times as long as Hadrian's Wall
In other words, 128 microns is 0.0000000011 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 910,000,000 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 120,000,000,000 microns (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 0.000000001 times as long as The 405
In other words, 128 microns is 0.0000000010983 times the length of The 405, and the length of The 405 is 910,500,000 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 116,540,000,000 microns. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about 0.0000000003 times as long as The Grand Canyon
In other words, 128 microns is 0.000000000287 times the length of The Grand Canyon, and the length of The Grand Canyon is 3,480,000,000 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446,000,000,000 microns 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 1,100,000,000 microns above the floor of Granite Gorge.
It's about 0.00000000010 times as long as The Rhine
In other words, 128 microns is 0.000000000097 times the length of The Rhine, and the length of The Rhine is 10,300,000,000 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 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 0.00000000006 times as long as The Colorado River
In other words, 128 microns is 0.0000000000549 times the length of The Colorado River, and the length of The Colorado River is 18,200,000,000 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 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 0.00000000005 times as long as The Danube
In other words, 128 microns is 0.0000000000449 times the length of The Danube, and the length of The Danube is 22,300,000,000 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 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 0.00000000004 times as long as The Oregon Trail
In other words, 128 microns is 0.0000000000367 times the length of The Oregon Trail, and the length of The Oregon Trail is 27,200,000,000 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.