An iceberg is a large piece of ice floating in the sea. They are generally found in cold water near the North or South Pole. Icebergs are especially common during spring, when ice has begun to melt. About 90% of an iceberg is below the water line and ten percent above. Just by looking at the part you can see, it is hard to tell how the part underwater looks, and how close you can get before crashing into it.