The Amsterdam Canal, which links more than 100 islands, is a 75-kilometer-long canal network of more than 160 canals and 1281 bridges. Amsterdam's central railway station is the center of the city. It is laid out through the Herengracht, Keizersgracht, Prinsengracht and the outermost Singel canal. Its main attractions are concentrated in the canal belt with a radius of about 1.5 kilometers.