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The physiography of Lake Vechten (The Netherlands) is described together with morphometric data . The lake (surface area 4 .7 ha ; mean depth 6 .0 m) consists of two basins with maximum depths of 10 .5 and 11 .9 m . Meteorological conditions in the region and horizontal groundwater flow play an important role in the renewal time, which is about two years . The lake has in most years a circulation period from November till April but in some years, when the ice cover is prolonged, it is stratified in winter as well . The summer stratification extending from May to the end of October is very stable, with an anaerobic hypolimnion . Eddy conductivity in the stagnant water is calculated . The water transparency is strongly influenced by the presence of algal and bacterial populations and by resuspended particulate matter . Secchi disk depth ranges from 1 .8 to 4 .5 m. The 1 % of the surface light reaches from 4 to 5 m depth in November and from 8 to 9 .5 m depth in May . The ionic composition and nutrient status of the lake are given .

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