The lake is actually ~99% on Norwegian territory, it's just a tiny edge on the end that's given to Sweden and Finland. We once tried to give Finland a mountain peak though (for their 100th anniversary of independence from Russia), but the constitution states the kingdom is indivisible so the legal work was deemed too much. It would have been their highest peak if it went through.
Nothing is out there! All there is is a lake and birds and fish. ... And a wooden walkway. ... And a big ass cement block. But there's nothing else there. It's a complete void. The environment is perfectly safe!