It's about 400 times as long as Baseball base distances.
In other words, the length of Baseball base distances is 0.0025 times 400 shackles.(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 1 shackles. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.
It's about one-four-hundredth as long as The Distance from L.A. to New York.
In other words, 400 shackles is 0.00244 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 410 times that amount.(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 164,000 shackles long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.
It's about one-four-hundredth as long as I-80.
In other words, 400 shackles is 0.00236583 times the length of I-80, and the length of I-80 is 422.6850 times that amount.(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 169,074 shackles. A 2,187.230 shackles stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about 550 times as long as a Cricket Pitch.
In other words, 400 shackles is 545.4550 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 0.00183333 times that amount.(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 0.7333330 shackles. The wickets at either end of the pitch stand 0.0262467 shackles tall including the bails.
It's about one-five-hundred-fiftieth as long as The Great Wall of China (wall only).
In other words, 400 shackles is 0.001753 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 570.50 times that amount.(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 228.20 shackles. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about 550 times as long as a Bowling Lane.
In other words, 400 shackles is 572.810 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.0017458 times that amount.(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 0.698310 shackles. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about one-six-hundredth as long as The Amazon River.
In other words, 400 shackles is 0.001705 times the length of The Amazon River, and the length of The Amazon River is 586.50 times that amount.(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 234,700 shackles. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.