The Fort of San Lorenzo is located at the entrance to the Chagres River
in the province of Colon
. It was declared by UNESCO as a World
Heritage Site in the year 1980 under the name of the Fortifications on the Caribbean coast of Panama, of the town of Portobelo
. They formed the defensive system to the transatlantic trade of the Monarchy of Spain
. It is a good example of military architecture of the 16th and 17th century.