Editing Cairn (section)

==Today==
[[File:Cairn Northumberland and Durham.jpg|thumb|Cairn at the boundary of Counties Durham and Northumberland, England]]

Cairns can be used to mark hiking trails, especially in mountain regions at or above the [[tree line]]. Placed at regular intervals, a series of cairns can be used to indicate a path across stony or barren terrain.

===Sea cairns===
[[File:Kummel Korpo 2009.jpg|thumb|200px|[[Sea mark]] in Finnish coastal waters]]
Coastal cairns called [[sea mark]]s are also common in the northern latitudes, especially in the island-strewn waters of [[Scandinavia]] and eastern Canada. They are placed along shores and on islands and islets. Usually painted white for improved offshore visibility, they serve as [[Navigational aid|navigation aid]]s. In Sweden, they are called {{lang|sv|kummel}}, in Finland {{lang|fi|kummeli}}, in Norway {{lang|no|varde}}, and are indicated in navigation charts and maintained as part of the nautical marking system.<ref>{{cite web |author=<!--Staff writer(s); no by-line.--> |url=http://portal.fma.fi/portal/page/portal/589032C37AAC7314E040B40A0A016368 |title=Legend (INT Symbology) |format=PDF |location=[[Helsinki]] |publisher=Finnish Transport Agency and Finnish Transport Safety Agency (TraFi) |work=Merenkulku.fi |url-status=dead |archive-url=https://web.archive.org/web/20120126004546/http://portal.fma.fi/portal/page/portal/589032C37AAC7314E040B40A0A016368 |archive-date=2012-01-26 }} Three-language key to reading Finnish navigation charts.</ref>