grey : 500m grid
black: 1000m grid

A Upper Chagrito
683900,1035500

B Chamor
681400,1025300

C Vistamares
673800,1020200

D Esperanza-Chagres confluence
674200,1029700

E Upper Chico
666000,1032700

F Lower Chagres
659900,1020200