It's about as long as The Panama Canal.
In other words, the length of The Panama Canal is 1 times 429 furlongs.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 440 furlongs in length. Ships passing through the Canal are raised (and then lowered) 0.130 furlongs above sea level through the lock-and-dam system.
It's about four-fifths as long as The English Channel.
In other words, 429 furlongs is 0.8070 times the length of The English Channel, and the length of The English Channel is 1.240 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 532 furlongs, 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 three-fourths as long as The 405.
In other words, 429 furlongs is 0.740530 times the length of The 405, and the length of The 405 is 1.35040 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 579.320 furlongs. 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 seven-tenths as long as Hadrian's Wall.
In other words, 429 furlongs is 0.720 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 1.40 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 600 furlongs (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 three times as tall as Olympus Mons.
In other words, 429 furlongs is 3.20 times the height of Olympus Mons, and the height of Olympus Mons is 0.310 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 130 furlongs. 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-fifth as long as The Grand Canyon.
In other words, 429 furlongs is 0.1940 times the length of The Grand Canyon, and the length of The Grand Canyon is 5.150 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 2,220 furlongs 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 5.470 furlongs above the floor of Granite Gorge.
It's about eight times as tall as Maxwell Montes.
In other words, 429 furlongs is 7.80 times the height of Maxwell Montes, and the height of Maxwell Montes is 0.130 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 55 furlongs. 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.