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Pollnagollum
Pollnagollum–Poulelva (usually referred to as Pollnagollum or Poulnagollum) is an active stream passage cave situated in County Clare, Ireland.
== Description ==
At over in length, Pollnagollum is the longest cave on the island of Ireland and the third deepest cave in the republic. The system primarily consists of winding stream passages which interconnect in various ways, offering a great variety of through trips. The cave is usually entered via the Pollnagollum entrance, with the main streamway encountered a short distance inside.
The main streamway continues for most of the length of the cave with several smaller inlets entering along its length. Near the southern end of the cave the Poulelva pot is encountered; the two entrances are often used for through-trips. Much of the water in the cave is fed from the sinks of Upper Pollnagollum, at the point where surface water runs off the shale bedrock and sinks into the permeable limestone. The terminus of the cave is a low bedding plane which eventually becomes too low to progress. The water resurges at the Killaney rising to the south of the cave.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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