Ascar, also known as Rathlóriel, was one of the seven rivers of Ossiriand, a region of the eastern Beleriand. The Ascar was one of the six tributaries to the great river Gelion. Beginning near Mount Dolmed, it flows into Gelion near Sarn Athrad where the Dwarf-Road coming from Nogrod and Belegost runs along its banks. After the fall of Doriath, its remaining treasures were placed in its deep depths by Beren, Dior and the Laiquendi, were afterwards it became known as Rathlóriel, the Goldenbed.