Ipanema City is located in the state of Rio de Janeiro, Brazil. It is a popular beach destination and is known for its beautiful beaches, vibrant nightlife, and stunning views of the Atlantic Ocean. The city is also home to the famous song 'The Girl from Ipanema' by Antonio Carlos Jobim. The three-letter solution to the crossword clue 'RIO' is RIO, which stands for the state of Rio de Janeiro.