Boca Toma, also called Boca de la Zanja, is a small weir on the Chubut River in Chubut Province, Argentina completed in 1919. It is a wall that causes a steep drop in the river, allowing water to be diverted into irrigation canals. Because the area has very low rainfall, this dam allows irrigation in the river valley.[1] The Boca Toma is located a few kilometers downstream from Dique Florentino Ameghino in Gaiman Department.[2]