Kyllölänsaari lies in the EteläSavo (South Savo) district in the community of Puumala, 60km south-east of Mikkeli. The bridge, which leads to the island separates the two parts of the Saimaa Lake called Ruokovesi (to the east) and Tammovesi (to the west). The water on both sides is clean, clear, deep, and rich in fishes.

Distances (by car): to Helsinki 280km, to Puumala50km, to Hurissalo (with a small food store) 15km, to the Sahanlahti Restaurant 40km, and to Ristiina (with a Supermarket, a pharmacy, a cash machine, and a kiosk) 40km.