Ice Age: The Meltdown

After the events of the first film, Manny, Sid, and Diego live in a valley that is surrounded by a high ice wall on all sides and is inhabited by many other creatures. The trio discovers that the ice wall is actually a dam that is barely holding a reservoir that could flood the valley if it fails. A vulture tells them that there is a boat at the other end of the valley that may save them, but they must reach it in three days. A chunk of ice breaks off from the top of the dam, initiating their immediate evacuation.