Maps and diagrams are preliminary and based upon ongoing compilation of information. Comments on the maps and suggestions regarding additional published or unpublished sources of information would be greatly appreciated. E-mail: aarcher@ksu.edu.

Fluvial and tidal stations in the Rios Amazonas and Para. Stations 5035 through 5049 refer to NOAA navigational tidal stations. Other station numbers are arbitrary control points. Rivers and coastlines from World Database II and digital topography from Smith and Sandwell (copyright 1997).

Mouth area of Rios Amazonas and Para showing locations of tidal data (from NOAA and other sources). Red dashed line is a "zero-line" used to calculate distances from this arbitrarily defined "mouth" for the fluvio-tidal systems. Rivers and coastlines from World Database II and digital topography from Smith and Sandwell (copyright 1997).

Water-level flux within Rios Amazonas and Para system. Tidal-range data from NOAA and other sources. Third-degree polynomial fitted to highest tidal ranges. Note that tidal flux extends over 800 km inland from the zero line. Prominent tidal stations include Macapa (5043), Belem (5049), Salinopolis (5047), and Breves (1400).

Fluvial flux data from a variety of published sources. Third-degree polynomial fitted to all fluvial-flux information. Prominent fluvial stations include Santarem (400), Obidos (500), Manaus (700) and Iquitos, Peru (980).