The First of the six rivers of Ossiriand counted from the North ( The seventh river of Land of Seven Rivers is Gelion.) Ascar or as later also named Rathlòriel defined the border between Thargelion and Ossiriand; it came from Ered Luin and ran 90 Miles before the junktion with Gelion. Along the Northern shore was the Dwarf-Road from Sarn Athred to Nogrod. The name Rathlòriel ( Goldenbed )was given to Ascar in F.A.502 when the treasure brought from the sack of Doriath was drowned in the river.