The concept of a river with "boiling water" is not a natural occurrence but rather a reference to geothermal hot springs or hydrothermal features found in certain regions around the world. These hot springs and geysers are characterized by the emergence of extremely hot water from beneath the Earth's surface. One of the most famous examples of such geothermal activity is found in Yellowstone National Park in the United States.

Yellowstone National Park, located primarily in the U.S. state of Wyoming, is renowned for its geothermal wonders. Within the park, you can find geysers, hot springs, and mud pots that showcase the Earth's geothermal activity. The most famous of these is Old Faithful, a geyser known for its regular eruptions, expelling scalding water and steam into the air.

The "boiling" appearance of the water in these hot springs and geysers is due to the extreme heat generated by molten rock (magma) deep below the Earth's surface. Water seeps into the ground and is heated by this molten rock, causing it to become superheated. When the pressure builds up sufficiently, the water is forcefully ejected in the form of a geyser eruption.

Yellowstone's geothermal features, including the Grand Prismatic Spring, Mammoth Hot Springs, and many others, draw visitors from around the world who come to witness the otherworldly beauty and power of these natural phenomena.

It's important to note that while these geothermal features may appear to have "boiling" water, the water is not actually at its boiling point due to the high pressure within the Earth's crust. Instead, it is superheated, meaning it has reached temperatures well above its normal boiling point at sea level.

These geothermal areas serve as reminders of the Earth's dynamic and geologically active nature. While Yellowstone is one of the most famous locations for such geothermal wonders, similar features can be found in various regions with volcanic activity around the world, each offering a unique and awe-inspiring experience for visitors.