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De Leijen, which is written in Frisian as'De Leien\\\', is a lake that lies between the Oostermeer (Eastermar) and Opeinde (De Pein). The lake did not arise naturally, but through peat extraction. As a result, the lake is shallow in many places. Many special bird colonies like to nest around the lake, but because of the increase in tourism and recreational use, the tranquility of the animals is disturbed. Instead, there is more boat traffic and people look for the landscaped beach on the east side of the lake. A catering facility is also located here, which promotes pleasant recreation and water sports. You will also cycle through the town of Rottevalle, with a small community of less than 2000 inhabitants. The small village was declared a'exemplary village\\\' of regional improvement programs in 1953. The entire village served as an exposition in which modern agricultural developments were central. Rottevalle is also mentioned in that capacity in the Canon of Friesland.