Jakarta signed sister city agreements with other cities, including Casablanca. To promote friendship between the two cities, the main avenue famous for its shopping and business centres was named after Jakarta's Moroccan sister city. No street in Casablanca is named after Jakarta. However, the Moroccan capital city of Rabat has an avenue named after Sukarno, Indonesia's first president, to commemorate his visit in 1960 and as a token of friendship. Jakarta has established a partnership with Rotterdam, especially on integrated urban water management, including capacity-building and knowledge exchange. This cooperation is mainly because both cities are dealing with similar problems; they lie in low-lying flat plains and are prone to flooding. Additionally, they have both implemented drainage systems involving canals, dams, and pumps vital for both cities for below-sea-level areas. Jakarta's sister cities are denoted below by the year they joined into a partnership with Jakarta.