It's about 3,000 times as long as a Grain of Sand
In other words, 3.50 meters is 2,800 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.000357 times that amount.(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.00125 meters. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about one-three-thousandth as tall as The Challenger Deep (Marianas Trench)
In other words, 3.50 meters is 0.00032104 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 3,114.90 times that amount.(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 10,902 meters below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
It's about one-three-thousandth as tall as Maxwell Montes
In other words, 3.50 meters is 0.00032 times the height of Maxwell Montes, and the height of Maxwell Montes is 3,100 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 11,000 meters. 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-seven-thousand-five-hundredth as tall as Olympus Mons
In other words, the height of Olympus Mons is 7,700 times 3.50 meters.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 27,000 meters. 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 one-twenty-five-thousandth as long as The Panama Canal
In other words, the length of The Panama Canal is 25,000 times 3.50 meters.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 88,000 meters in length. Ships passing through the Canal are raised (and then lowered) 26 meters above sea level through the lock-and-dam system.
It's about one-thirty-thousandth as long as The English Channel
In other words, 3.50 meters is 0.00003270 times the length of The English Channel, and the length of The English Channel is 30,600 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 107,000 meters, 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 one-thirty-five-thousandth as long as The 405
In other words, 3.50 meters is 0.0000300330 times the length of The 405, and the length of The 405 is 33,297 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 meters. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.