Germany (Deutschland) I find it to be really interesting, as well as being a good way to get accustomed to the sound of the language.
YouTube has many full matches of the main league, SuperPesis, and the English-language website of the Pesäpallo Association gives a really good glossary of terms ( http://www.pesis.fi/pesapalloliitto/int ... ocabulary/ ), as well as German and Swedish translations of the rules.