yep, that would make sense, after all,, Most lakes Were volcanos...and Indonesa is one of those odd places where there are it have hundreds of islands (actually got 3,000 islands!)...so it comes no surprise to of this sort of 3 lakes in existence...Planet Earth, somewhere is going to have some entertaining kinks, even in USA (and one other place , forgot where) has a spot where gravity is weird, on a slant...and that even drop objects will falls at an angle...
so yeah Earth is weird in the right places...it have to, other wise Earth would be Boring if no 'fun places'...Corals, dissappearing islands, stepped waterfalls, maybe even stepped jungles...