It's about as long as The Grand Canyon.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
It's about one-third as long as The Rhine.
In other words, 277 miles is 0.338 times the length of The Rhine, and the length of The Rhine is 2.96 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)
It's about three-and-a-half times as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 0.27 times 277 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)
It's about four times as long as The 405.
In other words, 277 miles is 3.8252 times the length of The 405, and the length of The 405 is 0.26142 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
It's about four times as long as The English Channel.
In other words, 277 miles is 4.17 times the length of The English Channel, and the length of The English Channel is 0.24 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)
It's about five times as long as The Panama Canal.
In other words, 277 miles is 5.1 times the length of The Panama Canal, and the length of The Panama Canal is 0.2 times that amount.(Canal de Panamá) (Panama)
It's about one-fifth as long as The Colorado River.
In other words, 277 miles is 0.191 times the length of The Colorado River, and the length of The Colorado River is 5.24 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 1,450 miles in length. Along this length, the river descends from its source, approximately 1.71 miles above sea level in the Rocky Mountains, to its mouth in the Gulf of California.