Mainhattan is a term referring to Frankfurt's skyline, especially that of its central business district, the Bankenviertel. The word is a portmanteau of Main, the river on which Frankfurt lies, and Manhattan, a reference to the inner city area's visually impressive high rises and skyscrapers, a special feature for a European city. Together with the historically important Imperial Cathedral of Saint Bartholomew and St. Paul's Church, these buildings form the skyline of the city.