Sarn Gebir were the Rapids of the Great River Anduin. They appeared as the river's course passed between the Emyn Muil, above the Falls of Rauros. As they were unnavigable rocks and stony eyots, a portage-way was build on the western bank of the river, facilitating light boats from Wilderland to Osgiliath, until the Orcs of Mordor began to multiply.
While the Fellowship of the Ring navigated the Anduin, Aragorn was preparing for the Rapids, but they reached them sooner than he reckoned, on midnight of 23 February. The stream pulled them towards the eastern bank, where they were ambushed by Orc archers from Mordor. The Fellowship paddled away from the rapids. During the next day they portaged a few miles to the foot of the rapids and resumed their paddling on the morning of 25 February.
 Other versions of the legendarium
 Portrayal in adaptations
- The ambush at the rapids of Sarn Gebir scene was actually intended to be in this film, to the point that an entire on-location set was built, but was not included in the final cut for one simple reason: before filming could begin on the set, record-breaking torrential rains and 20 foot high floodwaters washed away the entire set. So complete was the destruction that not even any wreckage of the set was ever found. Without the time or funding to construct a new set, the scene had to be cut from the script.
- ↑ J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "The Great River"
- ↑ J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Great Years"
- ↑ J.R.R. Tolkien, "Unfinished index for The Lord of the Rings", in Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, p. 327
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The History of Middle-earth Index, pp. 382-3