Havel

Havel, a tributary of the Elbe, which has its origin in a small lake in Mecklenburg, flows southward past Spandau to Potsdam, and thence west to Brandenburg, and finally north-west to its junction with the Elbe, opposite the town of Werben. It passes through several lakes and canals on its way. Its entire length is 220 miles; it is navigable to within 15 miles of its source; its drainage basin measures 10,160 sq. m. Its most notable tributary is the Spree, on which Berlin stands.