Lagoons and Coastal Barriers - geography.

Lagoons and Coastal Barriers - geography. Padre Island and Laguna Madre Padre Island forms a thin, graceful arc running parallel to the Texas coastline. Barrier islands such as Padre tend to develop on shallow, gently sloping seabeds. Ocean currents carry sand deposited offshore by rivers such as the Rio Grande, just south of Padre. When winds and currents drive waves into shallow offshore w...