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In page Calw:

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Calw is located in the valley of the Nagold in the Northern Black Forest at an altitude between 330 and 630 metres (1,080–2,070 ft) above sea level.[citation needed] The historic centre lies west of the river. The newer parts of town have developed on the surrounding slopes. The following streams also exist within the town: the Tälesbach, Ziegelbach, Wurstbrunnenbach, Schießbach, Schlittenbach und Schweinbach. In the northern part of the town, on the western slope of the Nagold valley is the cave known as the Bruderhöhle.