Hamburg, a major port city in northern Germany, is connected to the North Sea by the Elbe River. It is crossed by hundreds of canals and also contains extensive green areas. Near its center, the Inner Alster Lake has numerous boats and is lined with cafes. The city's central boulevard, Jungfernstieg, connects the Neustadt (new town) with the Altstadt (old town), which is home to monuments such as the 18th-century St. Michael's Church.