river – rio
(Pronounced ree-oh)
To remember that river is pronounced ree-oh (rio) in Spanish, use the following mnemonic:
The river cruise company had been closed for years, but they decided to reopen (rio) it with a big fanfare when the river cruise became popular again.

Rio is masculine, so it's el rio. Imagine elephants swimming across a river.

Examples of rio (river) in a sentence
El río Amazonas es el más largo del mundo.
(The Amazon river is the longest in the world.)
Me gusta nadar en el río cuando hace calor.
(I like to swim in the river when it is hot.)
Los niños jugaban cerca del río toda la tarde.
(The children played near the river all afternoon.)