prororoca

Updated: May 23, 2025

Following the upper branch, the jangada, after passing the islands of Caviana and Mexiana, would have found an embouchure of some fifty leagues across, but it would also have met with the bar of the prororoca, that terrible eddy which, for the three days preceding the new or full moon, takes but two minutes instead of six hours to raise the river from twelve to fifteen feet above ordinary high-water mark.

Jules Verne - Eight Hundred Leagues on the Amazon