It's about as long as The 405
It's about as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 1 times 254,900 cubits.(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 260,000 cubits (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 one-and-one-tenth times as long as The English Channel
In other words, 254,900 cubits is 1.09 times the length of The English Channel, and the length of The English Channel is 0.9170 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 234,000 cubits, 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-and-three-tenths times as long as The Panama Canal
In other words, the length of The Panama Canal is 0.770 times 254,900 cubits.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 190,000 cubits in length. Ships passing through the Canal are raised (and then lowered) 57 cubits above sea level through the lock-and-dam system.
It's about one-fourth as long as The Grand Canyon
In other words, 254,900 cubits is 0.2610 times the length of The Grand Canyon, and the length of The Grand Canyon is 3.830 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 976,000 cubits 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 2,410 cubits above the floor of Granite Gorge.
It's about four-and-a-half times as tall as Olympus Mons
In other words, the height of Olympus Mons is 0.230 times 254,900 cubits.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 59,000 cubits. 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 ten-and-a-half times as tall as The Challenger Deep (Marianas Trench)
In other words, 254,900 cubits is 10.690 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.093545 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 23,845 cubits 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.