The Paraná State coastland, located at the Brazil's southern region, have several special areas as the shore zones, ecological reserves, protection areas as well as and tourist special reserve areas. Therefore, the objective of this communication is to present the environmental zoning of the influence area of the Antonina and Paranaguá bays, situated on the northern coastal zone of the Paraná state. The researched area is between 25°00' to 26°00' South Latitude and 48°15' to 49°00' West Greenwich Longitude, pertaining to the Antonina, Morretes, Paranaguá and Pontal do Paraná counties. The environmental zoning methodological approach have considered the relief patterns and the geomorphologic properties of the drainage basins. These elements were correlated with the geological properties, vegetation, terrain declivity and soils. Twenty nine drainage basins have been studied, whose hierarchy varied from 3rd to 6th Sthraler's order. The analysis carried out confirmed that some parameters of the drainage net obey the Horton's law regularity pattern for mountains or coastal zone models. The geomorphic analysis showed to be possible delimiting the follow environmental zone: mountain zone, coastal plain zone ( sand bar plain and flood plain), and Mangrove zone.

(Financier support by PIBIC/UFPR/CNPq and PADCT/NIMAD)