Many lakes can be found throughout the Jura - the largest natural lake being Lac de Chalain , measuring 3 km long and 1 km wide .
The Jura mountains are not craggy and rocky like the Alps .
Many lakes can be found throughout the Jura - the largest natural Jura being Lac de Chalain , measuring 3 km long and 1 km wide .
The Jura mountains are not craggy and rocky like the Alps .