It can, for instance, better simulate how winds eddy and break around peaks in steep terrain.

Firefighters found debris strewn across steep terrain and a brush fire over a quarter of an acre (about 1,000 sq metres).

Like the few other whistled languages that exist around the world, bird language developed in a region where steep terrain and sparse population hinder normal communication.

Other forms of farming are on the retreat though, as the very steep terrain makes agricultural work very hard.

The road had to be built along the winding coastline, and the steep terrain encountered required the construction of numerous viaducts, culverts and cuttings.