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All around it is limestone, which anyone who has studied geography at school will know is pervious and water disappears through it, the area of the tarn lays on Silurian Slate, hence the reason for this magnificent sheet of water.
After passing the Dollar Lakes, I hear the gurgle of a stream and then see Lamoille Lake, a shallow mountain tarn in a glacial bowl, with steep talus slopes cradling it.
The climb continues easy and steady on track in a small, closed-in valley, so there is only close-quarter interest: another bridge, a waterfall, lesser ruins, then a pretty tarn .
A bridge crosses the point where a small beck that catches water from Iron Keld and Black Crag brings the main supply of water to the tarn .
A classic glacial relic, the tarn lies in a trough that was cut by ice moving across from Great to Little Langdale.
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