I'm looking for open bathymetric raster data of various European lakes. While it is relatively easy to find the high-quality bathymetric sea and ocean data (7.5 arcsec data, for those interested), I have a lot of trouble finding this data for lakes (preferably 7.5 arcsec or more detailed).

In specific, I'm looking for data of these lakes:

  • Lac Leman (CH/FR)
  • Lac d'Annecy (FR)
  • Lac du Bourget (FR)
  • Lago Maggiore (IT)
  • Lago d'Orta (IT)
  • Lago Trasimeno (IT): I found contour data for this lake
  • Lago di Bolsena (IT)

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