The Undeeps, consisting of the North Undeep and the South Undeep, were two large westward bends of the river Anduin. They were located between the Brown Lands and the Wold of Rohan, east of Fangorn Forest. The South Undeep was smaller. Both were strategic points with many shallows and wide shoals, giving rare easy crossing of the Great River for armies, and were used by the Balchoth, and by Eorl and his men coming southward, directly before the Battle of the Field of Celebrant.[citation needed]
Forts had been built in the Undeeps to protect Calenardhon during the time of Gondor's King Rómendacil II; however, these were neglected in the following centuries and had to be repaired by Steward Cirion. These were overwhelmed when the Balchoth attacked, in TA 2510.
Translations
| Foreign Language | Translated name |
| Polish | Płycizny |