Conclusions is an island where Milo, Tock and the Humbug jumped to. A person named Canby lives there.
Jumping and swimming
Whenever a person or animal comes to a conclusion without thinking first, they jump there, but one cannot jump back. One has to swim back, in the Sea of Knowledge and they did but the Humbug came out dry. The conclusions that they jumped to
Humbug: Nothing can possibly go wrong now!
Tock: We'll have plenty of time.
Milo: It certainly couldn't be a nicer day.