Strand De Beetse
Commonly known as ‘De Beetser koelen, these are three large lakes created in 1938 as a result of sand extraction. De Beetser Koele is the largest lake in Westerwolde and the largest in the wider area. It covers an area of 61 hectares.
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Sand extraction began in 1938. It is river sand deposited here about 800,000 years ago by precursors of the Rhine. It is the oldest visible soil material in Westerwolde.
Between the sand grains is glauconite, which gives De Beetserkoele its blue-green haze. The extracted sand is rinsed clean and sorted by grain size. The water used for this purpose flows back into the lake with the glauconite. The 30-metre-deep lake is popular with day trippers.