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Presented here are the digitised bathymetric surveys by Murray & Pullar for 4 key lochs in Scotland, with generated 2D and 3D contours. You can see Loch Morar above.
You can change the opacity and colours of the contours in the top-right, as well as change the basemap. The 'points' button will overlay the original survey values for depth (in feet). Clicking anywhere in the lake will provide info about the underlying data in the top-left.

Lake outlines are from the UK Lakes Portal, which contains OS data © Crown copyright and database right (2016).
3D contours here >>