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O rio Anços nasce do interior do maciço de Sicó numa zona marginal. Trata-se de uma nascente vauclusiana, no sector setentrional da orla mesocenozóica ocidental portuguesa (Cunha, 2003).

Com um débito anual estimado em 50 Mm3, esta é uma das mais importantes nascentes para o funcionamento hidrológico dos calcários do Dogger neste maciço (Cunha, 1990).

In: Reboleira, A.S. 2005. Qualidade da água da nascente de Anços (Serra de Sicó) com o uso de fitoperifiton.
Espeleodivulgação 6, pp 30-35.



Fotografias do Anços e de alguns dos mergulhos em gruta efectuados.  Fotos de A. Mendes, L. Neves, M. Lopes, P. Santos e R. Pinheiro.