The distance between Imre’s starting and ending coordinates today is 68.37 miles, so we estimate that he covered about 75 miles on the river. (updated to 86 after checking with Imre) Scrolling the map along his route, it doesn’t seem like he passed any populated areas.
The river still resembles a length of old lace. Imre prefers to put up his tent on islands, to keep further away from a possible bear visit.