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How long is 279 nautical miles?

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It's about one-and-one-fifth times as long as The Grand Canyon.
In other words, 279 nautical miles is 1.160 times the length of The Grand Canyon, and the length of The Grand Canyon is 0.8620 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 241 nautical miles 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 0.5940 nautical miles above the floor of Granite Gorge.
It's about two-fifths as long as The Rhine.
In other words, 279 nautical miles is 0.3910 times the length of The Rhine, and the length of The Rhine is 2.560 times that amount.
(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 713 nautical miles in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about four-and-a-half times as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 0.230 times 279 nautical miles.
(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 65 nautical miles (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 four-and-a-half times as long as The 405.
In other words, 279 nautical miles is 4.43370 times the length of The 405, and the length of The 405 is 0.225550 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 62.9270 nautical miles. 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 one-fifth as long as The Colorado River.
In other words, 279 nautical miles is 0.2220 times the length of The Colorado River, and the length of The Colorado River is 4.50 times that amount.
(a.k.a. Aha Kwahwat, a.k.a. Grand River, a.k.a. Tizon River, a.k.a. Tecon River, a.k.a. Tison River) (from Grand Lake, Colorado through the Gulf of California)
The Colorado River runs 1,260 nautical miles in length. Along this length, the river descends from its source, approximately 1.480 nautical miles above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about five times as long as The English Channel.
In other words, 279 nautical miles is 4.830 times the length of The English Channel, and the length of The English Channel is 0.2070 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 57.80 nautical miles, 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-fifth as long as The Danube.
In other words, 279 nautical miles is 0.1810 times the length of The Danube, and the length of The Danube is 5.520 times that amount.
(a.k.a. Donau, a.k.a. Dunaj, a.k.a. Dunav, a.k.a. Duna, a.k.a. Дунав (Dunav), a.k.a. Dunărea, a.k.a. Дунáй (Dunay), a.k.a. Tuna) (from Breg Martinskapelle, Black Forest, Germany through the Danube Delta, Romania)
The Danube river runs 1,540 nautical miles in total length. Intersecting Vienna, Austria; Bratislava, Slovakia; Budapest, Hungary; and Belgrade, Serbia, the Danube touches more capital cities than any other river.