English name: Estuaries

Description (English)

Downstream part of a river valley, subject to the tide and extending from the limit of brackish waters. River estuaries are coastal inlets where there is generally a substantial freshwater influence. The mixing of freshwater and sea water and the reduced current flows in the shelter of the estuary lead to deposition of fine sediments, often forming extensive intertidal sand and mud flats. In addition to herbs, they can also be colonised by shrubs creating thickets (e.g. Tamarix spp.). Where the tidal currents are faster than flood tides, most sediments deposit to form a delta at the mouth of the estuary. Baltic river mouths, considered as an estuary subtype, have brackish water and no tide, with helophytic wetland vegetation and luxurious aquatic vegetation in shallow water areas. Littoral and sublittoral habitat types typical of estuaries are included in A2 and A5, although many other habitat types including tidal rivers may occur in estuaries. Includes Transitional waters as defined by the Water Framework Directive.

EUNIS habitat classification
Interpretation Manual of the habitats targeted by Resolution No. 4

Quick facts

EUNIS habitat type code X01
Bern Convention Resolution 4 habitat type (used for designation of Emerald sites)
Relation to Annex I habitat types (EU Habitats Directive)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Not available

Other classifications

Classification Code Habitat type name Relationship type
Palaearctic Habitat Classification 200112 13.2 Estuaries same
CORINE Land Cover 5.2.2. Estuaries n/a
Ramsar Wetland Types F Estuarine waters not defined
For relation to plant communities (syntaxa), see Vegetation types
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