Bring the Befouled Water Globe to Je'neu Sancrea at Zoram'gar Outpost, Ashenvale.
The Earthen Ring is a shamanistic group dedicated to studying and preserving the elements. They have forgotten more about crazy old gods, ancient legends and lore than most scholars will ever know.
Lucky for you, I know someone in the Earthen Ring here in Ashenvale. Head over to Zoram'gar Outpost on the coast of the Zoram Strand; show Je'neu Sancrea what you found. If anyone can figure out that globe's significance, it'd be him.