Près de la ville de Lerna se trouve le célèbre lac mythologique de Lerna, qui est actuellement plus un marais qu'un lac. Dans ce lac vivait l'Hydre de Lerne, une bête aquatique serpentine avec de nombreuses têtes. C'était l'un des Douze Travaux d'Hercule. Sous les eaux du lac, il y avait une entrée vers les Enfers.
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