Natural Lime-Rich Lakes

Lakes like this are extremely rare and unusual because limestone substrates are free draining. Malham Tarn is rich in calcium, but poor in other nutrients. It is particularly important for its submerged beds of stoneworts (Chara spp). Malham Tarn is of very high biodiversity importance in the Yorkshire Dales National Park.

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Natural Lime-rich Lakes Habitat Action Plan (opens in new window)