It's about one-two-hundred-thousandth as tall as Maxwell Montes.
In other words, 2.10 inches is 0.00000480 times the height of Maxwell Montes, and the height of Maxwell Montes is 210,000 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 430,000 inches. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.
It's about one-five-hundred-thousandth as tall as Olympus Mons.
In other words, 2.10 inches is 0.00000200 times the height of Olympus Mons, and the height of Olympus Mons is 500,000 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 1,100,000 inches. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about 0.0000006 times as long as The Panama Canal.
In other words, 2.10 inches is 0.000000610 times the length of The Panama Canal, and the length of The Panama Canal is 1,600,000 times that amount.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 3,500,000 inches in length. Ships passing through the Canal are raised (and then lowered) 1,000 inches above sea level through the lock-and-dam system.
It's about 0.0000005 times as long as The English Channel.
In other words, 2.10 inches is 0.0000004990 times the length of The English Channel, and the length of The English Channel is 2,000,000 times that amount.(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 4,210,000 inches, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about 0.0000005 times as long as The 405.
In other words, 2.10 inches is 0.00000045770 times the length of The 405, and the length of The 405 is 2,184,800 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 4,588,200 inches. 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 0.0000005 times as long as Hadrian's Wall.
In other words, 2.10 inches is 0.000000440 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 2,300,000 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 0.0000001 times as long as The Grand Canyon.
In other words, 2.10 inches is 0.000000120 times the length of The Grand Canyon, and the length of The Grand Canyon is 8,330,000 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.