This means that in estuaries located in the Northern Hemi-sphere marine organisms can penetrate farther upstream on the left side when one faces seaward.
In the Southern Hemi-sphere they extend up the right side.
In regions of little freshwater runoff and high evaporation, the salinity of the water increases.
An example is Laguna Madre, a shallow bar-built estuary with limited access to the open ocean that par-allels the Texas coast for 185 km
.