Great Lakes these waterways is heavy. Pleasure boats can also enter or exit the Great Lakes by way of the Erie Canal and Hudson River in New York. The Erie Canal connects to the Great Lakes at the east end of Lake Erie (at Buffalo, New York) and at the south side of Lake Ontario (at Oswego, New York). In 2009, the lakes contained 84% of the surface freshwater of North America; if the water were evenly distributed over the entire continent's land area, it would reach a depth of 1.5 meters (5 feet). The source of water levels in the lakes
Griebnitzsee of lakes towards the Großer Wannsee. The remaining water flows through the Griebnitzsee to its western end, where it flows into the River Havel near Potsdam. The length of the Griebnitzsee is navigable, and forms part of the Teltow Canal route that links the River Havel with the River Spree and the Oder-Spree Canal, bypassing the reach of the River Spree through central Berlin. The navigable Griebnitz Canal provides an alternative link from the Griebnitzsee to the River Havel via the Großer Wannsee. During the time of the Berlin Wall, the border between Berlin and East Germany ran down the