FIGURE 2. The fish weirs (zigzag structures and ponds).
From the following article:
An artificial landscape-scale fishery in the Bolivian Amazon
Clark L. Erickson
Nature 408, 190-193(9 November 2000)
doi:10.1038/35041555

They are concentrated in the North Block (447 km2 of savanna excluding forest islands) and the South Block (77 km 2). The structures are restricted to savannas near forest islands that are flooded by shallow water.
