In the Southeast of the world (outpost at the right side of the image for reference), going out form Waldhaus. Exact route can be seen on the image. The red line is the exact intended highway location. The black and white markers are ranger markers, each single-coloured stretch is 20 tiles long. The extra stretch going off past the peat bog to the water is optional, the idea was to have it there as a possible landing point for ships.