The present study focusses on differences in litter production of a terra firme forest fragment and an adjacent mangrove stand on the coast of the Bragan a region. Litterfall was quantified by means of 10 litter traps (0.5 m2) in the mangrove and 10 in terra firme forest, installed along a transect orthogonal to the division between the two ecosystems. Material was collected fortnightly. Litter production in the mangrove forest (11.8 t.ha-1yr-1) was by a third higher than in terra firme forest (8.7 t.ha-1yr-1). Leaves were the most important litter component in both ecosystems (68 e 63% for mangrove and terra firme, respectively). In the mangrove, Rhizophora mangle contributed the major part of litter material. In terra firme, leaves of species of the families Simaroubaceae, Burseraceae e Arecaceae contributed 13, 12 e 11% of the leaf total; 54% of leaves were not identified taxonomically. In the mangrove, reproductive litter components showed seasonal patterns. It was not possible to identify a clear seasonal pattern in R. mangle leaf litter fall. However in mangrove and terra firme, total litter production was higher in dry season.