I would go as far as saying there actually isn't a southern park. As I said earlier there are only two playground polygons there that should be combined - one with a name and one without a name. This playground has a name "Leikkipaikka Sannanpuisto" (https://palvelukartta.hel.fi/en/unit/26038). Unfortunately this can be a bit misleading as it has the finnish equivalent for park ie. "puisto" in the name. As I said earlier this should be named "LEIKKIPAIKKA Sannanpuisto" to emphasize that it's in fact the name of the playground and not the park.