To this point the railway ran in the floodplains of the Ottawa or Bonnechere River, where the land is quite flat and the line is fairly straight. The line left the Bonnechere plain between Douglas and Eganville, where the terrain becomes more rugged. The line begins to meander, characteristic of any railway crossing the Canadian Shield. On the eastern end of Golden Lake, south of the town of the same name, the line turns due west. It also wyed off the Pembroke Southern Railway which ran northeast to Pembroke (closed in 1961). The OA&PS passed through the towns of Killaloe, Wilno and Barry's Bay, where it turned northwest again to avoid several large lakes in the Barry's Bay area. The line turned southwest again to reach Madawaska, the line's divisional point. Just west of town, the Egan Estates Railway branched off to run north into the bush.