The Yacumama is a mythical giant snake, believed to be up to 60 meters in length, that is said to inhabit the Amazon river basin in South America. The legend of the Yacumama is known in Paraguay, Argentina, and Brazil, where it is considered the protector of water and is believed to be unstoppable.

Local shamans claim that the Yacumama travels to an area called the Boiling River. According to the legends, the Yacumama is the mother of all marine life and has the ability to suck up any living thing within 100 paces. Before entering the river, locals would blow on a conch horn, believing that the serpent would reveal itself if it was in the area after hearing the noise.

The indigenous people have shared testimonies of the Yacumama devouring its prey, stating that it spits out giant splashes of water to take down its victims. There have been accounts of fishermen and their vessels disappearing, with some claiming to have heard a chilling noise after the disappearance.

In the 1900s, there was a reported sighting where two men attempted to kill the Yacumama by detonating an explosive in the river. Although the snake was covered in blood, it was not dead and swam away, leaving the men terrified.

Some believe the Yacumama could be the extinct Titanoboa, a snake that grew to around 12 meters, with some scientists speculating that it could have been even larger. Fossils of Titanoboa have been found with holes in them, suggesting that it may have been venomous. Due to its size, it is likely that Titanoboa was an apex predator, feeding on large prey such as rodents, birds, and small mammals. Research also indicates that Titanoboa may have been an aquatic snake, as its fossils were primarily discovered in waterlogged areas.