A giant powerful vortex has suddenly appeared in Lake Texoma, one of the largest reservoirs in the U.S., draining the lake into its diameter.

Footage of the vortex ,which is "eight feet in diameter and capable of sucking in a full-sized boat," made onlookers gasp with fear as it would seemingly suck anything that get nears it.

However, the giant hole isn't a mystery at all, since it is created by draining some water from the reservoir, Assistant Lake Manager BJ Parkey said, according to Business Insider.

"Just like in your house when you fill a bathtub full of water and [open] the drain, it will develop a vortex or whirlpool," Parkey said.

The flowing water creates a cyclone shape, revealing a wider opening at the top tapering off to a narrow funnel. He also said that the vortex is more likely to be three feet wide but can get bigger as more water is released.

The Texoma reservoir, created by the Denison Dam, is located on the border of Oklahoma and Texas, spanning three miles (4.8 km) in length. Water tends to build up in the reservoir, and when it reaches a peak, the Army opens the floodgates at the lake's bottom to drain some of the water into the river.

Buoys and warning signs have been placed around the area to restrict any boats from entering the vortex region, which is currently intense due to huge amounts of rain in the area, ABC News reported.

Lake Texoma reached a record-breaking height of almost 646 ft (197 metres) above sea level at the beginning of the month.