Radio Prague's Monthly Quiz

Black Lake (Černé jezero), Šumava – biggest and deepest lake (surface 18.4 ha, max. depth 39.8 m)

Test your knowledge of things Czech!

On the first day of the month Radio Prague will announce the month’s quiz question on this site. At the end of every month we will draw six winners from the correct answers received. Join our contest and win a Radio Prague prize! Answers should be sent to [email protected] by the end of the month.

The winners will be featured on this site.

Question for September

During the second half of this year, the Czech Republic will hold the rotating Presidency of the Council of Europe. When did the Czech Republic head the EU Council for the first time?

Question for August

August weather traditionally entices people to go swimming. The biggest natural lakes in the Czech Republic can be found in Šumava. Tell us the name of the largest of them.

The correct answer for August

Černé jezero (Black Lake) – with an area of 18.4 hectares, this lake is situated close to the municipality of Železná ruda at an altitude of 1008 metres above sea level. The depth of the lake reaches up to 40.6 metres in some places, which also makes it the deepest non-karst lake in the country.


  • Eva Gonzales, USA
  • Ivar Lass, Estonia
  • Michael Lindner, Germany
  • Marian Ondrašik, Czech Republic
  • Robert Essoh, Cameroon
  • Francoise Wouters, Belgium
  • Competition