Ford of Brithiach
From Tolkien Gateway
An important ford of the River Sirion. The crossing was in the upper part of the river's course, on the northern borders of Brethil. A road led across it from West Beleriand into Dimbar, and then on into the perilous valley of Nan Dungortheb. The ford is often referred to simply as 'The Brithiach', a name that seems to come from the Elvish for 'gravel crossing'.
