You'll find two Disc Golf Parks just next to Mäntyharju center: Mäntyharju Disc Golf Park appr. 50m from the railway station and Pappila Disc Golf Park close to the centre.
Read more: www.mantyharju.fi/discgolfparks/
NB: From this link mantyharju.fi/mantyharju-in-english/ you'll find a brochure in English.