Lowland flooded savanna and woodland geocomplex. 1. Deciduous phreatophyllous forest: Swartzia jorori-Anadenanthera colubrina community. Shallow water tables, on upland fluvial paleo-levées (sandy-loamy gleysols). 2. Palm woodland: Piptadenia robusta-Copernicia alba community. Temporarily ponded sodium-alkaline soils with gilgai microrelief on semi-elevations (planosols, vertisols). 3. Ponded herbaceous savanna: Paspalum plicatulum-Paspalum virgatum community. Mesotrophic soils on temporarily ponded topographic semi-elevations. 4. Flooded riparian forest: Croton sampatik-Albizia inundata community. Seasonally flooded savanna streams levees (fluvic). 5. Flooded open Palm savanna: Combretum laxum-Copernicia alba community. Mesotrophic soils (planosols, gleysols). Seasonally flooded alluvial plain. 6. Semipermanently ponded herbaceous hummocky savanna: Arundinella hispida-Hypogynium virgatum community. Ancient alluvial floodplain topographic depressions with oligotrophic soils. 7. Seasonally flooded herbaceous savanna: Paspalum fasciculatum community. Recent alluvial floodplain with flowing white waters. 8. Swamp woodland: Ludwigia peruviana-Tabebuia insignis community. Ancient alluvial floodplain, in lakes and ponds with deep histic hydromorphic soils (tropical saprimoor). 9. Marshland: Rhabdadenia pohlii-Cyperus giganteus. “Junquillo” sedge-marsh communities in swamps and lakes with semi-floating hydromorphic soils (tropical fibrimor). 10. Aquatic Beni vegetation: Cabomba furcata-Nymphaea amazonum communities. 11. Temporarily ponded woodland: Tabebuia heptaphylla-Callisthene fasciculata community. Precambric shield lateritic pedeplain of Beni transitional to Cerrado in semi-elevations. Termite-mound oligotrophic soils (stagnosols, gleysols). 12. Seasonally flooded woodland: Byrsonima orbignyana-Tabebuia heptaphylla community. North Beni lateritic pedeplain transitional to Cerrado in oligotrophic soils (gleysols). Graphic geobotanical interpretation based on cited references, our own field data (Trinidad-San Ramón del Beni transects) and Google Earth images.