sentences:  As the first of these names indicates, the path was partially wooded, as its southern reaches crossed the transition zone between the western prairies and eastern woodland.From Fort Garry, southbound cart trains followed the eastern edge of the Red River's Great Plains, crossing the Roseau River and the international border.In Minnesota, the trail was joined by a route coming from Pembina to the northwest, and continued south on a level prairie in the former lakebed of prehistoric Lake Agassiz.