Rivil's Well

Then over fen and field and mountain
he folowed, till beside a fountain
upgushing hot from fires below
he found the slayers and his foe. . .
- The Lay of Leithian

"[Beren] swore. . . an oath of vengeance. First therefore he pursued the Orcs that had slain his father and his kinsmen, and he found their camp by night at Rivil's Well. . ."

― The Silmarillion, Of Beren and Lúthien

Rivil's Well was the spring of the river Rivil, flowing from Dorthonion. It was here Beren recaptured the Ring of Felagund from Orcs after the Massacre at Tarn Aeluin.