Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Droogmakerij de Beemster (Beemster Polder)' has mentioned 'River' in the following places:
Occurrence Sentence Text Source
The name "Beemster" has been derived from "Bamestra" (see Groenedijk, 2000), the name of a small river in the area.
In the period 1150-1250 peat-digging by people, and storm floods, enlarged that small river into an inland sea, a lake in open connection with the Zuiderzee.