“…-159 - (Calderón, 2010), in Ecuador there are marine weirs in the Ligüipi area and in Amazonic Bolivia there are ancient weirs linked to lacustrine and marshy environments (Erickson, 2000). Argentina has a history of marine weirs in the Gulf of San Matías, in the province of Río Negro (Cardillo and Scartascini, 2016) and in the Beagle Channel (Vázquez and Zangrando, 2017). In Chile, there are references to marine weirs between latitudes 4°S -54°S (Álvarez et al, 2008) and it is possible to find structures both on continental marine coasts and on islands and in archipelagic systems (eg Furlong, 1917;Emperaire, 1963;Cárdenas et al, 1991;Torres, 2009;Borlando, 2016) and fluvial weirs also exist between latitudes 37°S -42°S (Álvarez et al, 2013).…”