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623 leagues is about one-and-a-half times as long as The Colorado River
In other words, it's 1.49 times the length of The Colorado River, and the length of The Colorado River is 0.671 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 419 leagues in length. Along this length, the river descends from its source, approximately 0.4950 leagues above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
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