Extract of a Schmettau map from 1767/1787 with a part of the today’s District Oder-Spree, Brandenburg, Germany. The map shows the villages Herzberg, Glienicke (today parts of the municipality Rietz-Neuendorf) and Lindenberg (part of the municipality Tauche). It shows also the northern part of the Blabbergraben with the Herzberger lake und Lindenberger lake. Today, the first part of the Blabbergraben towards the Herzberger See exists still in a rudimentary form.