» Alviela

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Rated 2.5/5 stars (58 ratings)

Overview Location & Specifics Conditions Resources Nearby Systems  
Access is difficult – 4m long ladders and ropes required to negotiate through a short (25m) but cumbersome dry cave session to reach the water.

Alviela is one of the major springs in Portugal and was once the major source of water in Lisbon; today less than 10% of Lisbon’s water consumption comes from Alviela. The entrance is situated in a Park area which is a popular swimming venue for the local population. There is also a camping site, restaurant and toilets on-site. The local municipality built a science exhibition pavilion on site, which features a virtual 3D trip through the cave system with explanation about cave formations and water cycles.

The cave drops quickly to 30m (around 100m penetration) with most of the passages located between the 40 and 55m depth range. The "supposed" main tunnel then drops steeply down to 125m and continues according to the last 2002 exploration effort (SPE and FFESSM). Recently (2007) Jeróme Meynié supported by SPE, reached 130m and returned with news of a blocked passage, and silt on the floor of the high flow main tunnel. Lots of exploration opportunities exist in this beautiful cave.
CM1442, 2380, Portugal
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Latitude: 39.44398
Longitude: -8.71265
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 Cave Diving
 Cavern Diving
 Open Water Diving
Olhos de Água
Date Submitter Visbility Remarks
6/6/2010 António Carrilho 15-20' Very low flow and the line is in good shape
Click here if you would like to contribute any information or resources for this system.
Description Type Date Author Remarks
 Exporation Site Web Site
 System Map Map 2008
 System Map #2 Map 2002
 Video YouTube 2011
Sslect Search Radius:
System Depth Cave Cavern OW Last Report Distance (mi)
 Overview Information Available for Almonda  Almonda 266 True False False 6/11/2010 6.7
   Poio True False False 4/18/2010 6.2