This article aimed to elaborate and analyze the geomorphologic map of the infl uence area of Coastal Plain of Pelotas, due to the lack of information more detailed of physical geography from the municipality. For that, it was obtained the support in methodological orientations of Ab'Sáber (1969) , International Geographical Union (IGU) (DEMEK et al., 1972) , Ross (1992) and "Instituto Brasileiro de Geografi a e Estatística" (IBGE) (2009). The mapping adopted the scale 1:125.000 and provided the

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... identifi cation of ordered geomorphological facts in terms of the analysis scale, in four hierarquy levels: 1st) Morphostructure of Pelotas Basin; 2nd) Morphosculpture of Coastal Plain; 3rd) Morphological patterns of pontal, plains, dunes, lombadas and terraces; 4th) Morphocronogenetic units of pontal, lacustrine plain, paludal plain, fl uvio-lacustrine plain, fl uvio-lagoon plain of São Gonçalo, fl uvio-lagoon plain and fl uvio-coluvionar plain (~ 5 ka); lagoon terrace and fl uvio-lagoon terrace (~ 120 ka); coastal dune, coastal lombada, lagoon terrace and fl uvio-coluvionar terrace (~ 325 ka). About the morphodynamics, it was verifi ed that: periodical oscillations of the water table in surface; decrease of water infi ltration in the soil and intensifi cation of surface runoff in the urban area; susceptibility to laminar erosion in exposed soil of the rural area; and changes of fl uvial, lagoon and paludal hydrodynamics. Above all, the presented results provide supports as an instrument of management and to the environmental planning, through the delimitation of relief compartments which signals constraints to the covers' substitution for land's using.