Sucuriju gigante (giant sucuri, giant boa, or giant anaconda) is a legendary giant snake, an Amazon rainforestconstrictor described as up to 40 meters (130 ft) long, 80 centimeters (31 in) around, and weighing up to 5 tons. It is sometimes described as horned. Some tribes from the Amazon speak of sucuri gigante as the anaconda, referring to it as the creator of the Amazon River. It is also referred to as "Mysterious Beast" and "Controller", as it is said to control the areas of the rivers it inhabits. A sub-species of the common green anaconda (Eunectes murinus) has been suggested as the origin of the legend, but some speculation has proposed that it could be a descendant of Gigantophis, a large snake from the Eocene period, (58 million to 34 million years BPE) that could reach 33 feet (10 m) in length.