Usumacinta_(Grijalva) -92.5 18.5 -92.0 16.7 -94.00 17.75 -94.00 17.00 -94.00 16.25 -93.75 16.00 -93.25 16.00 -93.00 15.75 -93.00 15.25 -92.75 15.00 -92.00 15.00 -91.00 15.00 -90.25 15.00 -90.00 15.25 -90.00 16.00 -90.00 16.75 -90.25 17.00 -90.75 17.00 -91.00 17.25 -91.00 17.75 -91.25 18.00 -91.75 18.00 -92.00 18.25 -92.00 18.75 -92.25 19.00 -92.75 19.00 -93.00 18.75 -93.00 18.25 -93.25 18.00 -93.75 18.00 -94.00 17.75