What are the state territorial reserves under Article 122, and how many meters of coast, lake or river can never be private property?

Art. 122 of the Constitution reserves to the state the ownership of four strips: 3 km along the Pacific and Atlantic coasts measured from the high-tide line, 200 m around lake shores,… 100 m on each side of the banks of navigable rivers and 50 m around the springs and water sources that supply towns. Within them a private party cannot be the owner; only a lease from the state through OCRET is possible. Excepted are properties located in urban zones and rights recorded at the Registry before 1 March 1956; to acquire properties covered by those exceptions foreigners need authorization from the Executive, and where properties have been declared national monuments or lie within monumental complexes the state holds a preferential right over any transfer.