Ice Age: Continental Drift: The Junior Novel by Susan Korman

It's just a normal day in pre-history, when suddenly Manny finds himself separated from his family by a huge, gaping hole in the earth! As the continent splits in two, Manny sets off to find the land bridge that will reunite him with his loved ones—but not without the help of his friends Diego and Sid. Together they sail the high seas in search of home, but before long they run into a rowdy group of pirates. Can the trio navigate the sea, escape the grips of the vicious pirates, and make it back to Manny's family before the gap gets too large?