1.1.
A zone may comprise: an entire water catchment area from its source to its estuary; or part of a water catchment area from the source(s) to a natural or artificial barrier that prevents the upward migration of aquatic animals from lower stretches of the water catchment area; or more than one water catchment area, including their estuaries, due to the epidemiological link between the catchment areas through the estuary. The geographical demarcation of the zone shall be clearly identified on a map.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-02 · Text as adopted (Official Journal); later amendments are not incorporated in this text.