In accordance with and without prejudice to the rights granted by unilateral acts, to the provisions of
bilateral treaties among the Parties and to the principles and rules of International Law, the Contracting Parties mutually guarantee on a reciprocal basis that there shall be complete freedom of commercial navigation on the Amazon and other international Amazonian rivers, observing the fiscal and police regulations in force now or in the future within the territory of each. Such regulations should, insofar as possible, be uniform and favour said navigation and trade.