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CWM IDWAL
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    View W from top of the rock-step at the S end of Cwm Idwal - close-up view of base of Twll Du and the rockfall. Steep backwall cliff of the cwm in the background. R limb of the syncline (centred on Twll Du) can be seen on the R in the cliff wall. Between the rock step in the foreground and the rockfall is an area of till and a moraine ridge.