The document compares key facts about Istanbul and Rio de Janeiro across several categories. It states that Istanbul has a larger area (5434 vs 1260 square km) and population (13.4 million vs 6.3 million) than Rio de Janeiro. While the primary language of Istanbul is Turkish and Rio is Portuguese, both cities have multiple languages. Popular sports in each city include football, with Rio also known for capoeira and motorsports, and Istanbul also known for basketball and Formula 1.