The haunted fenland northwest of the Black Gate, which has slowly swallowed the graves of the great battle of the Last Alliance fought on the plain of Dagorlad beside it. Candles of corpse-light flicker over the pools, and the faces of the dead — Elves, Men, and orcs — gleam beneath the water, luring travellers to join them. Gollum led Frodo and Sam through it by paths he had learned, warning them: do not follow the lights.