It's about half as long as The Grand Canyon.
In other words, 151 miles is 0.545 times the length of The Grand Canyon, and the length of The Grand Canyon is 1.83 times that amount.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
It's about two times as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 0.5 times 151 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 two times as long as The 405.
In other words, 151 miles is 2.0852 times the length of The 405, and the length of The 405 is 0.47957 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
It's about two-and-a-half times as long as The English Channel.
In other words, 151 miles is 2.27 times the length of The English Channel, and the length of The English Channel is 0.441 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 three times as long as The Panama Canal.
In other words, 151 miles is 2.8 times the length of The Panama Canal, and the length of The Panama Canal is 0.36 times that amount.(Canal de Panamá) (Panama)
It's about one-fifth as long as The Rhine.
In other words, 151 miles is 0.184 times the length of The Rhine, and the length of The Rhine is 5.43 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 820 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 nine times as tall as Olympus Mons.
In other words, the height of Olympus Mons is 0.11 times 151 miles.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 17 miles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.