sentences:  Lough Lene is a deep lake, which is deep in some parts.It is a clear hard water lake with marl deposition particularly noticeable along long stretches of its shores.The lake supports a range of pondweeds that include "Potamogeton perfoliatus" and "P. lucens", Canadian pondweed ("Elodea canadensis"), and a variety of stoneworts ("Chara" spp., such as "C. pedunculata" and "C. curta") which are marl or hard-water lake indicators.