A Gruta dos Moinhos Velhos (juntamente com a Gruta da Pena e a Gruta da Contenda), faz parte de uma grande rede de galerias com mais de 11 Km de extensão, constituindo dos mais importantes sistemas subterrâneos do Maciço Calcário Estremenho. Caracteriza-se pela existência de dois coletores paragenéticos fósseis, de diâmetro aproximadamente decamétrico, com afluentes desenhando uma rede dendrítica e um conjunto de galerias semi-ativas de traçado dendrítico a norte e angulado a sul. A zona fóssil tem um desnível de 100 metros e a espessura da zona intermédia varia entre 80 metros a montante e 60 metros a jusante, circulando a água por galerias singenéticas, do quadrante norte para o quadrante sul, em direção à exsurgência da Gruta da Pena.

Podem definir-se quatro fases na evolução do sistema. A primeira é representada por galerias freáticas superficiais, de pequeno diâmetro, a segunda pelo coletor paragenético da Galeria Gémea, a terceira pela Galeria Grande e seus afluentes e a última pelas galerias ativas e semi-ativas dos andares inferiores.

Best Resorts in Porto de Mos

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Resorts in Porto de Mos

1 bedroom, individually decorated, individually furnished, desk

Deluxe Villa, 1 Bedroom (Town House) | Living room | LCD TV

"Well equipped apartment, easy access, friendly staff,quiet"

$130 nightly

Aug 31 - Sep 1

Total includes taxes and fees

Deluxe Double or Twin Room, Balcony, Golf View | In-room safe, desk, blackout drapes, soundproofing

"Have stayed here for the last few years at various points and it gets better and better year after year "

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Top Porto de Mos Hotel Reviews

Crisol Tres Pastorinhos

10/10 Excellent

"Inside was very clean. Beds were super comfy and the breakfast for 10 euro was worth it "

Hotel Oceano

10/10 Excellent

"The beach access is amazing!! The hotel would do well to have the restaurant fix their chairs because staying above the restaurant all you hear all day and night are the chairs scraping across the floor. Besides that hotel is clean, convenient, AC worked well. The area around is nosy (my room was ocean view) so it's to be expected that you hear all the action. We also had a balcony (not many rooms so) and I found that really worthwhile to people watch at night! "