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The headwaters will then flow down to a lower level (often making a sharp bend, called an elbow of capture) over a steep slope, called a knickpoint. A waterfall will form here. Rejuvenation then occurs, causing rapid downwards erosion. An excellent example is the capture of the River Burn by the River Lyd, Devon, England.
The Pillars of Hercules represent the promontories of Gibraltar and Ceuta. The shield represents the regions of Castile, Léon, Aragón, Navarre, and Granada. Effective date: 18 December 1981.
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