> the freshwater plume of the Amazon River extends more than 60km into the ocean. It really doesn't, or perhaps only in the most pedantic sense. That "ocean"

> the freshwater plume of the Amazon River extends more than 60km into the ocean. It really doesn't, or perhaps only in the most pedantic sense. That "ocean" is still the mouth of the Amazon itself, and most of it's less than 10 meters deep. It's really the estuary of the river itself. See: https://www.frontiersin.org/articles/10.3389/fmars.2017.00026/full https://www.frontiersin.org/articles/10.3389/fmars.2017.0002...