claim: Donna Noble is the therapist of the Doctor.
evidence: The Sacrow -- Paretz Canal , or Sacrow-Paretzer-Kanal in German , is a canal in the German state of Brandenburg .. German. Germany. canal. canal. Brandenburg. Brandenburg. Paretz. Paretz. It provides a short cut for vessels navigating the River Havel , linking the Jungfernsee , near Potsdam , with Paretz .. River Havel. Havel. Jungfernsee. Jungfernsee. Potsdam. Potsdam. Paretz. Paretz. Building of the canal started in 1874 , and it was opened in 1876 .. canal. canal. Since then it has been widened and deepened twice , once between 1888 and 1890 , and again in the 1920s .. Unlike the Havel Canal , which also provides a short cut for the River Havel , and also has its downstream end at Paretz , both ends of the Sacrow -- Paretz Canal are downstream of Berlin .. River Havel. Havel. Paretz. Paretz. Havel Canal. Havel Canal. Berlin. Berlin. The canal is 12.5 km long , of which 7.5 km comprises artificially cut channel , whilst the rest is accounted for by several lakes .. canal. canal. Besides the Jungfernsee , these include the Weißer See , the Fahrlander See and the Schlanitzsee .. Jungfernsee. Jungfernsee. Weißer See. Weißer See ( Potsdam ). Fahrlander See. Fahrlander See. Schlanitzsee. Schlanitzsee. The canal has no locks , and is crossed by four bridges .. canal. canal. locks. Lock ( water transport ). Category  : Canals in Brandenburg. Brandenburg. Brandenburg. Category  : Federal waterways in Germany. Category  : Canals opened in 1876. CSacrow-Paretz. Paretz. Paretz. CSacrow-Paretz. Category :Havel basin