"Jamie O’Brien and company connected the Waimea River on the island of Oʻahu to the surrounding ocean for an epic surf session but these dudes created a monster that made Jamie’s look like child’s play," the Unofficial Networks says.

"This thing was absolute chaos and was borderline unridable for a hot minute. They are claiming they created “the world’s largest river wave” and I haven’t seen evidence to the contrary."

"River waves are a beautiful thing. And there are plenty yet to be discovered. This group of adventurers, who together comprise the YouTube channel “Sickos,” discovered a trapped body of water during their travels and decided to create a wave, similar to the one at Waimea Bay," The Inertia says.

"The concept is simple: dig a small trench to allow the trapped water to reach the ocean, then let gravity do the rest. Water is a powerful force. Well, this river wave got a wee bit out of hand. Thankfully, the only thing broken were boards."

"An Oregon-based group of extreme sports enthusiasts recently constructed a way to trigger waves in the tranquility of the river. The group of adventurers coupled their enthusiasm with science and created enormous wave crests in the stable water body," the Essentially Sports says.

"A group of American surfers recently discovered a trapped water body during their travels. Now, the river situated alongside the beach sparked an idea in the adventurers’ innovative minds. The young surfers decided to create waves in the river by digging a small trench from the ocean to the stable water body. After they dug the trail, they left the rest at the hands of gravity.

"Once the high-intensity waves of the ocean met the river, the trail started to generate big waves. Following this, the surfers hopped on the waves with their surfboards and started paddling onto the waves induced by the river. Sharing the video of their extraordinary adventures, LADbible Australia took to its Facebook handle to give a peek at the surfers’ creativity."

"Therefore, when the famous Waimea River became swollen like never before following wild rains and locals opened it up to the Bay to create biggest rivermouth waves ever seen there and Jamie tried to ride it only to be sucked out to sea and returned barely alive, gasping, claiming he’d almost died, well, what a tragedy that would’ve been for surfing," the Beach Grift says.

"Here, we see the angry river as it roars through the valley, we see the small channel dug that creates the impetus for the whole thing to open up and create the wildest river mouth I ever seen.

"And we see Jamie, who is mobbed by fans the minute he arrives in the carpark, pawing his way up the beach like a wretched sailor after a terrible quarter of an hour battling a ten-foot shorebreak and twenty-knot currents."

"Waimea Bay is located in Haleiwa on the North Shore of O'ahu in the Hawaiian Islands at the mouth of the Waimea River. Waimea Valley extends to the east of Waimea Bay. Waimea means "reddish water" in Hawaiian.

"In winter, Waimea and other North Shore locations such as Pipeline and Sunset Beach host a number of surfing contests because of the large waves found here. These waves are created by winter storms in the North Pacific, and their arrival on O'ahu's North Shore is typically forecast accurately several days in advance. In summer, Waimea typically has clear and calm water.

"The surf break at Waimea Bay was significant in the development of Big wave surfing. Larger surf at the bay went unridden for years until November 7, 1957 when a handful of surfers finally paddled out and rode the giant waves that break off the northern point of the bay. While the surf only breaks big several times a year, Waimea was the most prestigious big wave surf break in the world for decades. With the advent of tow-in surfing, more and more big wave breaks have been discovered that are far superior in quality to Waimea. However, the bay still holds a significant place even in today's world of big wave surfing."

"Without any interference, the river will usually break through or dissolve the rain ends. However, many local surfers will typically dig out a trench through the berm and join the trench to the backed-up water, causing the flowing river to open up the beach and empty into Waimea Bay. As a result, it creates a fun-to-ride, standing wave, as seen in the clip above," the Surfer says.

"During the rainy winter months, the Waimea River begins to flow out of the valley. However, the built-up sand causes the river to be unable to pour into the bay, its natural terminus. As a result, the water backfills the valley and the marsh behind Waimea Bay beach.

"According to reports, sand is moved around the North Shore by currents and waves during the summer and winter. Since the area has some of the biggest waves and strongest currents, sand builds up on the beach."