It's about one-thirty-five-thousandth as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 34,000 times 3.50 meters.(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 meters (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 35,000 times as long as a Strand of Hair
It's about 35,000 times as tall as a Human hair, Strand of
It's about 40,000 times as tall as a sheet of Paper
It's about one-one-hundred-fifty-thousandth as long as The Grand Canyon
In other words, 3.50 meters is 0.000007850 times the length of The Grand Canyon, and the length of The Grand Canyon is 127,000 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446,000 meters 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 m above the floor of Granite Gorge.
It's about one-four-hundred-thousandth as long as The Rhine
In other words, 3.50 meters is 0.000002650 times the length of The Rhine, and the length of The Rhine is 377,000 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 meters 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 450,000 times as long as a Red Blood Cell
In other words, the length of a Red Blood Cell is 0.00000210 times 3.50 meters.(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles)
An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.