Rio Hueyapan drains most of the southern Santa Marta´s then merges with Rio Grande de Catemaco
before its merger with Rio San Juan. Although placid most of the year, in 1998 and again in 2005,
torrential rains caused major floods and substantial damage to lives and property.

Normally the river only overflows regularly and causes problems to the same people that continue to
live in its flood path.
Major Rivers of Los Tuxtlas

Rio Hueyapan