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Lake Arreo
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Location	Lantarón, Álava, Basque Country, Spain
Coordinates	42°46′42″N 2°59′28″W / 42.7783°N 2.9911°W / 42.7783; -2.9911
Type	Lake
Max. length	338 m (1,109 ft)
Max. width	246 m (807 ft)
Surface area	6.57 ha (16.2 acres)
Max. depth	24.8 m (81 ft)
Water volume	0.35 hm (280 acre⋅ft)
Ramsar Wetland
Designated	24 October 2002
Part of	Lago de Caicedo-Yuso y Salinas de Añana
Reference no.	1258
Natura 2000 site (SAC)
Official name	Caicedo Yuso eta Arreoko lakua / Lago de Caicedo Yuso y Arreo
Designated	May 2016
Reference no.	ES2110007
Area	1.48 km (0.57 sq mi)

Lake Arreo (Basque: Arreoko aintzira, Spanish: Lago de Arreo), also known as the Caicedo-Yuso Lake (Basque: Caicedo-Yusoko aintzira, Spanish: Lago de Caicedo-Yuso) is a lake in the province of Álava, Basque Country, Spain. With a surface of 6.5 ha (16 acres), it is the only natural lake in the Basque Country.

Flora and fauna

Hydrophytes found within the lake itself include Myriophyllum verticillatum, M. spicatum, Ceratophyllum submersum, Potamogeton pectinatus, P. coloratus, P. gramineus, P. nodosus, P. pusillus, P. lucens, Ranunculus trichophyllus, R. peltatus baudoti, Polygonum amphibium and Utricularia australis. The shallow shores of the lake are home to plants species including Schoenoplectus lacustris, common reed, Typha angustifolia, Cladium mariscus. Due to the existence of a salt spring near the lake, species found in saline areas such as Juncus acutus, Juncus gerardi, Spergularia marina, Parapholis incurvaand Plantago coronopus are also present.

Mallards, Eurasian coots and great crested grebes have been observed at the site. According to a study by the Basque Water Agency [es], four species of fish are present in the lake. Only the tench is autochthonous; while the largemouth bass, Eurasian carp and the pumpkinseed are introduced.

References

1. "Lago de Caicedo-Yuso y Salinas de Añana". Ramsar Sites Information Service. Retrieved 7 October 2022.
2. "Site factsheet for Caicedo Yuso eta Arreoko lakua / Lago de Caicedo Yuso y Arreo". EUNIS. European Environment Agency. Retrieved 14 October 2022.
3. Rico, E.; Chicote, A.; González, M.E.; Montes, C. (1995). "Batimetría y análisis morfométrico del lago de Arreo (N. España)" (PDF). Limnética. 1 (11): 55–58. doi:10.23818/limn.11.07. S2CID 132537693.
4. Documento de información ecológica, objetivos de conservación, normas para la conservación y programa de seguimiento para la designación de la Zona Especial de Conservación (ZEC) Lago de Arreo-Caicedo de Yuso (ES2110007) y del Biotopo Protegido del Diapiro de Añana (PDF). euskadi.eus (Report) (in Spanish). Dirección de Medio Natural y Planificación Ambiental. September 2015. Retrieved 7 October 2022.
5. "Censos de aves acuáticas nidificantes en la Comunidad Autónoma del País Vasco" (PDF). euskadi.eus (in Spanish). Basque Government. 2008. Retrieved 7 October 2022.
6. Manzanos Arnaiz, Alberto (7 October 2011). "Estudio censal de las comunidades de peces en el Lago Arreo" (PDF). euskadi.eus (in Spanish). URA. Retrieved 7 October 2022.

External links

• Media related to Lake Arreo at Wikimedia Commons

• Lakes of Álava
• Natura 2000 in the Basque Country (autonomous community)
• Ramsar sites in Spain
• Protected areas established in 2002
• Protected areas of the Basque Country (autonomous community)
• Wetlands of the Basque Country (autonomous community)