keskiselänne

keskiselänne is a Finnish term that translates to "central ridge" or "median ridge." It is most commonly used in geology to describe a prominent, elongated elevation of land that lies in the middle of a larger geographical area. This feature can be formed by various geological processes, including tectonic uplift, volcanic activity, or erosion.

In Finland, the term keskiselänne often refers to a type of esker formation. Eskers are long, winding ridges of sand and gravel deposited by glacial meltwater. These features are characteristic of glaciated landscapes and are found throughout Finland, remnants of the last ice age. A keskiselänne, in this context, would be a particularly significant or prominent esker, often forming a major topographical feature within a region.

These ridges can influence local hydrology and ecosystems. They can act as natural barriers, affecting water flow and creating distinct microclimates on their slopes. Vegetation often differs between the higher, drier ridge and the surrounding lower, moister areas.

The term can also be used more generally to describe any distinct central ridge in a landscape, not exclusively related to glacial features. For example, a mountain range might have a central, highest ridge that could be referred to as a keskiselänne. The specific geological context is usually clear from the surrounding text.