Large boats navigate the Amazon River daily transporting people, animals and goods. Margin accompanies one of these boats as it departs from the border between Brazil and Colombia and heads towards the Peruvian city of Iquitos. On their journey the passengers reminisce on the stories and myths of this region in perpetual change. Margin is a film adrift, a journey into the routine of those who live on the banks of the Amazon River, retracing the links between past and present as time slowly goes by.