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From Helsinki, aim for Itäväyla (road 170). 4.8km after the roundabout at Kehä 3, turn left onto Bäckängsvägen/Puroniityntie. After 600m, turn left and follow the arrow for "koirametsä". After about 300m you'll arrive at a big parking.
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Throw the pads out of the car, walk 20m into the forest, climb.
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From Itäkeskus, busses 841 and 842 (they go every 30min) bring you the closest. Getting of at Korsnäsintie leaves you with a walk of 1,3km.