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.

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Cabin Rentals in Mira de Aire

Seasonal outdoor pool, open 10:00 AM to 8:00 PM, sun loungers

"Great place !!!!! I would only advice the hotel to have a lunch and dinning redtaurant open for guests."

$91 nightly

Jul 23 - Jul 24

Total includes taxes and fees

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

"Excellent view and hotel amenities"

$189 nightly

Aug 17 - Aug 18

Total includes taxes and fees

"The location is unique directly on the 2,2km wide beach"

$111 nightly

Jul 24 - Jul 25

Total includes taxes and fees

Indoor pool, open 10:00 AM to 8:00 PM, sun loungers

"Hotel was great. "

$193 nightly

Jul 27 - Jul 28

Total includes taxes and fees

"Nice staff. Facilities are ok, well used stainedcarpets a dshower curtain, but sheets were clean."

$44 nightly

Jul 23 - Jul 24

Total includes taxes and fees

"Great location at a great price."

$93 nightly

Jul 29 - Jul 30

Total includes taxes and fees

Double or Twin Room (Santa Maria Plus) | 1 bedroom, minibar, in-room safe, desk

"A great hotel next to the Sanctuary. It has a cute store, and a great restaurant, also free parking!"

$114 nightly

Aug 2 - Aug 3

Total includes taxes and fees

Outdoor pool, pool umbrellas, sun loungers

"Excelente "

$154 nightly

Jul 23 - Jul 24

Total includes taxes and fees

Daily continental breakfast (EUR 12.50 per person)

"Great place to be if you are looking for convenience and simplicity in the heart of town."

$47 nightly

Jul 27 - Jul 28

Total includes taxes and fees

Seasonal outdoor pool, open 9:00 AM to 7:00 PM, pool umbrellas

"Stop at this review and look elsewhere. Very confusing check in, thats if you can find the reception area. The bungalows are very outdated and worn out. A lot of mildew inside. Terrible sewage smell. "

"Nice place. Nice rooms. "

$111 nightly

Jul 27 - Jul 28

Total includes taxes and fees

"Good hotel"

$128 nightly

Jul 23 - Jul 24

Total includes taxes and fees

"Wonderful place"

$171 nightly

Jul 27 - Jul 28

Total includes taxes and fees

2 outdoor pools, pool umbrellas, sun loungers

"Romantic spot"

$188 nightly

Jul 30 - Jul 31

Total includes taxes and fees

"Staff was very friendly and helpful. Hotel is nice and have a lot of things for kids to do. Only downside ia that the hotel had just opened for the season and was not fully ready. I recommend and would stay again."

$88 nightly

Jul 31 - Aug 1

Total includes taxes and fees