This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Limnades (Greek)
In Greek mythology, the Limnades were a type of Naiad. They lived in freshwater lakes. Their parents were river or lake gods. They are female nature entities that are bound to a particular location or land form. Naiads are water nymphs, and inhabit fountains, wells, springs, brooks, rivers, marshes, ponds and lagoons.
The essence of a naiad was bound to the water body she inhabited. If a spring dried, the naiad within it died. In some stories naiads are depicted as dangerous creatures, because they could take men underwater when fascinated by their beauty, and these men were never to be seen again. Naiads were known by their jealous nature.