Seine Commercial craft (barges and push-tows) can use the river from Marcilly-sur-Seine, to its mouth. At Paris, there are 37 bridges. The river is only above sea level from its mouth, making it slow flowing and thus easily navigable. The Seine Maritime, from the English Channel at Le Havre to Rouen, is the only portion of the Seine used by ocean-going craft. The tidal section of the Seine Maritime is followed by a canalized section ("Basse Seine") with four large multiple locks until the mouth of the Oise at Conflans-Sainte-Honorine (170 km). Smaller locks at Bougival and at Suresnes lift the
Mouth of the Aguapeí Private Natural Heritage Reserve Mouth of the Aguapeí Private Natural Heritage Reserve The Mouth of the Aguapeí Private Natural Heritage Reserve () is a private natural heritage reserve in the state of São Paulo, Brazil. It protects an area of marshland known as the "Pantanal of São Paulo" where the Aguapeí River enters the Paraná River. The Mouth of the Aguapeí Private Natural Heritage Reserve (RPPN) is divided between the municipalities of Castilho, São João do Pau d'Alho and Pauliceia in the state of São Paulo. It has an area of . It is located at the mouth of the Aguapeí River on the