Ice road
Ice roads are frozen, human-made structures on the surface of bays, rivers, lakes, or seas in the far north. They link dry land, frozen waterways, portage
Portage or portaging refers to the practice of carrying watercraft or cargo over land to avoid river obstacles, or between two bodies of water. A place where this carrying occurs is also called a portage; a person doing the carrying is called a porter.The English word portage is derived from the...

s and winter road
Winter road
Winter roads are temporary highways carved out of snow and ice. They facilitate transportation to and from communities without permanent roads, and are commonly seen in isolated regions in Canada's north....

s, and are usually remade each winter. Ice roads allow temporary transport to areas with no permanent road access. Seen in isolated regions
The Bush
"The bush" is a term used for rural, undeveloped land or country areas in certain countries.-Australia:The term is iconic in Australia. In reference to the landscape, "bush" describes a wooded area, intermediate between a shrubland and a forest, generally of dry and nitrogen-poor soil, mostly...

 of northern Canada
Northern Canada
Northern Canada, colloquially the North, is the vast northernmost region of Canada variously defined by geography and politics. Politically, the term refers to the three territories of Canada: Yukon, Northwest Territories, and Nunavut...

, Alaska's Bush, northern Scandinavia
Scandinavia is a cultural, historical and ethno-linguistic region in northern Europe that includes the three kingdoms of Denmark, Norway and Sweden, characterized by their common ethno-cultural heritage and language. Modern Norway and Sweden proper are situated on the Scandinavian Peninsula,...

 and Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

, they reduce the cost of materials that otherwise would ship as expensive air freight
Cargo airline
Cargo airlines are airlines dedicated to the transport of cargo. Some cargo airlines are divisions or subsidiaries of larger passenger airlines.-Logistics:...

, and they allow movement of large or heavy objects for which air freight is impractical.

Ice roads differ from winter roads in that they are built primarily across frozen waterways.