Tag:natural=strait

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Public-images-osm logo.svg natural = strait
Strait.svg
Description
A narrow area of water surrounded by land on two sides and by water on two other sides.
Used on these elements
may be used on nodesmay be used on waysmay be used on areasuse on relations unspecified
Useful combination
Status: Unspecified

Description

A strait is a narrow area of water surrounded by land on two sides and by water on two other sides forming a connection between those bodies of water. Typical cases include passages between islands or connections of bays and gulfs to the open ocean. Straits are significant and often named features as either sea travel routes, for water exchange or as fish migration routes.

Straits exist in the ocean but also in larger lakes. They are not necessarily named strait, they are frequently also called channel, passage, sound or similar.

How to map

Straits can be mapped with either nodes, ways or as areas. Since the ends of a strait are often poorly defined like in case of a passage between two islands of convex shape it is often difficult to map them in a verifiable way as a way or an area.

  • when mapping as a node this node should usually best be placed approximately in the middle between the coasts of the strait at the narrowest point - like in case of the Strait of Gibraltar.
  • when a strait is long, narrow and curved or has side channels or an otherwise complex and ambiguous coastline form it often makes sense to map it as a linear way. This should roughly follow the centerline of the water channel like in case of the Matochkin Strait.
  • in cases where the ends of the strait are well defined you can also map the strait as a closed way or a multipolygon relation enclosing the area generally understood to constitute the strait. In this case the sides of the strait towards land should coincide with the coastline.

See also