German President Horst Koehler and his wife Eva Luise arrived at Rotterdam Airport Monday morning for what was Koehler's first state visit to the Netherlands since he took office in 2004. Much of the visit will be spent broadening all aspects of Dutch-German cooperation - political, scientific and economical. Among others, the German president is due to visit the so-called Euregion, DPA reported. In recent years, the province of Twente in the Eastern Netherlands bordering with Germany has increasingly become a role model for far-reaching Dutch-German cooperation and integration. In this sense, the state visit's programme follows the German president's expertise on the subject of European integration and development.