. . "The Greater Gelion was the larger of the two sources of the River Gelion in Beleriand. The Greater Gelion's origin was Mount Rerir and it ran southeast near Maglor's Gap until it joined the River Gelion about seventy-five miles from its source."@en . "Greater Gelion"@en . . "The Greater Gelion was the larger of the two sources of the River Gelion in Beleriand. The Greater Gelion's origin was Mount Rerir and it ran southeast near Maglor's Gap until it joined the River Gelion about seventy-five miles from its source."@en . .