In 1703 territorial waters were defined as extending out to three nautical miles of the coast - the distance that could be covered by a cannon shot. In 1958 the Geneva Convention introduced the concept of baselines from which all other measurements would begin. Baselines were to be smooth and parallel too, rather than following the detailed indentations of the coast. Baselines join headlands and may run to the low-water mark of islands. All waters - marine and transitional (estuarine) on the landward side of baselines - are part of the internal (inland) waters of the State. The territorial sea extends out to 12 nautical miles from the baselines. The Irish Republic territorial sea covers an area of 27,487 km squared. The area covered by internal waters is 13,650 km squared.

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Theme Government
Date dataset released 2016-01-31
Date dataset updated 2016-09-30
Dataset conforms to these standards The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
Rights notes ['Creative Commons licence conditions apply', 'https://creativecommons.org/licenses/by/4.0/', 'license', 'https://creativecommons.org/licenses/by/4.0/', 'license']
Update frequency Never
Language English
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-11.0, 50.0],[-11.0, 56.0], [-5.0, 56.0], [-5.0, 50.0], [-11.0, 50.0]]]}
Spatial Reference Systems (SRS) WGS 84 (EPSG:4326)
Vertical Extent {"maxVerticalExtent": "-1", "verticalDomainName": "sea level", "minVerticalExtent": "-200"}
Provenance information Data created from Baselines Survey 2016 coordinates published under the Irish Statute Book.
Period of time covered (begin) 1959-07-29