Conversation so far:
where does the nith river start and end
The Nith river begins in a woodland northwest of Crosshill and west of Waterloo Regional Road 5 Region of Waterloo and ends at the Grand River in Paris.
where does the nith river go after the start at woodland northwest of crosshill
The Nith River heads north into Perth County, then turns sharply southwest and passes through the communities of Fernbank and Millbank in Perth East.
where does the nith river go after it passes through the communities of fernback and millbank
The Nith River continues south, takes in the right tributary Smith Creek and arrives at the community of Nithburg.

Question: where does the river go after nithburg
Self-contained rewrite: where does the nith river go after arriving at the community of nithburg