Study of dugout canoes from the coast of La Plata River and the islands of the Parana Delta, Argentina

In the La Plata Basin, indigenous populations used canoes for colonizing islands, moving people, fishing, transporting loads, and warfare. According to sixteenth century chronicles, dugout canoes were large, up to 24 m in length, and had a capacity for 40 people. In this paper, four dugout canoes recovered in La Plata River, and in the Parana Delta, are studied. Their context of discovery, dimensions, radiocarbon dating, and the wood taxonomic identification are presented. Canoes were vital for the riverine populations that inhabited the study area since at least two thousand years ago but constitute a rare record given the low likelihood of preservation. The studied canoes measure between 10-8 m in length and 0.9-0.7 m beam. Two of the canoes were dated between 1509-1647 and 1414-1465 cal AD, 1 sigma. The diagnostic characters identified in the wood link all the samples to Enterolobium contortisiliquum. The use for centuries of the same species in different areas shows the importance of the type of raw material selected and reflects a shared knowledge of the properties of the dry wood: light and porous that contributes to buoyancy, easy to work, and with mechanical resistance. This, in addition to the size of the tree, up to 30 m high and 2.5 m in diameter, has favored its preference for the manufacture of hulls. These watercrafts constitute a unique cultural heritage on the pre-Hispanic naval engineering of the skilled navigators of the La Plata Basin.