I left out a sentence again, which I had to vary.
The schools involved are all situated near natural parks, such as Marais Poitevin in France, Naturpark Schwäbischer Wald in Germany, and the Mogliasso sanctuary (reserve) on the bank of the River Tanaro in Italy.
I'd use a colon (:) after "parks," not the words "such as" --
The schools involved are all situated near natural parks: Marais Poitevin in France, Naturpark Schwäbischer Wald in Germany, and the Mogliasso Sanctuary on the bank of the River Tanaro in Italy.