Shipping hazard is a term used to describe any potential danger that can be encountered while transporting goods by sea. This includes natural obstacles such as ice floes, icebergs, bergs, and reefs. Ice floes are large pieces of floating ice that can cause damage to ships if they are not navigated around. An ICEBERG is a large mass of ice that has broken off from a glacier and is floating in the ocean. A berg is a smaller version of an ICEBERG, and a REEF is an underwater formation of rocks or coral that can also pose a threat to ships.