<https://lake-certovo-jezero.czech-mountains.eu/#place>
<http://schema.org/description>
"This lake is situated on a slope of the rock formation Čertova stěna at a height 1030 metres north-west of Železná Ruda, near the lake Černé jezero. It is aproximately 250 m long nad 150 metres wide, its area being 10,31 ha and its depth 36,5 metres."
<https://lake-certovo-jezero.czech-mountains.eu/>