The Frio River is a river in the U.S. state of Texas. The word frío is Spanish for cold, a clear reference to the spring-fed coolness of the river.
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The Neretva River is one of the natural symbols of Herzegovina. It is 230 km long, the longest tributary of the Adriatic Sea from the east coast. The portal Science Blurtit from Great Britain states that the Neretva is the coldest river in the world. The river basin covers a total area of 10,386 square kilometers.
The Shanay-Timpishka, also known as La Bomba, is a tributary of the Amazon River, called the only boiling river in the world. It is 6.4 km (4.0 mi) long. It is known for the very high temperature of its waters—from 45 °C (113 °F) to nearly 100 °C (212 °F).