I am reluctantly not at all a fan of these kinds of publications of unknown historical sites. All it does is expose to thieves where untold archeological sites are to be found.
The sheer complexity of canals[1], [2] tides, [3] seasonality influences a great deal on who will have the guts, time and money to visit the region.
[1] https://onlinelibrary.wiley.com/doi/abs/10.1002/eco.1863
[2] https://www.tide-forecast.com/locations/Macapa-Amazon-River-...