Known as simply the trail, it was a particularly dangerous route through the forests of Kaedwen leading to the Lixela river. It was on the Trail that Geralt, Ciri and Triss Merigold encounterd a caravan bound for Aedirn being escorted by Commissar Vilfrid Wenck, Yarpen Zigrin and his men.
There is another route called "the Trail" but known as "the Killer" to young witchers.