A mass of ice can be referred to by several different terms. A FLOE is a sheet of floating ice, usually found in the ocean. A berg is a large piece of ice, often seen in the Arctic or Antarctic regions. An ICEBERG is a large piece of ice that has broken off from a GLACIER and is floating in the ocean. A GLACIER is a large mass of ice that moves slowly down a mountain or valley. A serac is an isolated block of ice found on a GLACIER. An icicle is a hanging piece of ice formed by the freezing of dripping water.