Naiads

They were the nymphs of rivers, streams, lakes, marshes, fountains and springs.

Parents: Potamoi 

Naiad1.jpg
A Naiad, 1893, by John William Waterhouse.

Naiads were often the object of archaic local cults, worshipped as essential to humans. Boys and girls at coming-of-age ceremonies dedicated their childish locks to the local naiad of the spring.

Pegaeae were the nymphs of springs.
Crenaeae were naiads of fountains.
Potameids presided over rivers and streams.
Limnads and Limnatids inhabited lakes.
Heleionomae were the nymphs of marshes and wetlands.