“…The inlet widening happened probably due to the formation of another channel through breaching the sand spit that forms the inlet margin. The constant southward migration (updrift) process of the Ararapira Inlet has already been analyzed and discussed in several studies (Tessler, 1988;Angulo, 1993;Tessler and Mahiques, 1993;Angulo, 1999;Mihaly and Angulo, 2002;Muller, 2007;Angulo et al, 2009;Muller, 2010;Bazzo, 2011). According to Angulo (1993), the concave form of the southern margin supports erosive processes governed by ebb currents in a similar process of river meanders.…”