It's about 0.0000001 times as tall as a Mauna Loa.
In other words, 918 microns is 0.00000010010 times the height of a Mauna Loa, and the height of a Mauna Loa is 9,990,000 times that amount.(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 9,200,000,000 microns above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about 0.00000009 times as tall as The Challenger Deep (Marianas Trench).
In other words, 918 microns is 0.0000000842050 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 11,876,000 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 10,902,000,000 microns 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 0.00000009 times as tall as Maxwell Montes.
In other words, 918 microns is 0.0000000830 times the height of Maxwell Montes, and the height of Maxwell Montes is 12,000,000 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 11,000,000,000 microns. 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 0.00000004 times as tall as Olympus Mons.
In other words, 918 microns is 0.0000000340 times the height of Olympus Mons, and the height of Olympus Mons is 29,000,000 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 27,000,000,000 microns. 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 0.000000010 times as long as The Panama Canal.
In other words, 918 microns is 0.00000001000 times the length of The Panama Canal, and the length of The Panama Canal is 100,000,000 times that amount.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 88,000,000,000 microns in length. Ships passing through the Canal are raised (and then lowered) 26,000,000 microns above sea level through the lock-and-dam system.
It's about 0.000000009 times as long as The English Channel.
In other words, 918 microns is 0.000000008580 times the length of The English Channel, and the length of The English Channel is 117,000,000 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 107,000,000,000 microns, 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 0.000000008 times as long as The 405.
In other words, 918 microns is 0.00000000787710 times the length of The 405, and the length of The 405 is 126,950,000 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.