Tag:natural=atoll

The tag natural=atoll is used to map an atoll (sometimes called a coral atoll), a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely, and may include small islands or islets.

How to map

As a node: if the full extent of the atoll, including the reef, cannot be yet be mapped, then place a node at the approximate center of the atoll.

As an area: draw a closed way around the outer border of the reef, including all of the islands and the lagoon within the area. This is the most common way of mapping atolls.

Use a multipolygon relation if the atoll has more than one area; draw two or more closed ways and add each to the relation with role=outer.

• Add the following tags: natural=atoll and name=<name of the atoll>

• Note: place=island must be use the coastline when mapped as an area or relation, but natural=atoll should include the entire area of the coral reef and lagoon, in addition to any island or islets.

• Consider adding the islands to a multipolygon relation with place=archipelago if the group of islands has a name.

Tags used in combination

• name=*
• wikipedia=*

See also

• place=island - for tagging each island within the atoll
• place=islet - for very small islands
• place=archipelago - to map the islands of the atoll or a chain of atolls.
• natural=coastline - to map the coast of any islands within an atoll
• natural=reef - to map the reef which surrounds the atoll

Examples

• Bikini Atoll
• Motu One