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        <gco:CharacterString>Perustana merialuejaolle on sisä- ja ulkoalueiden erottaminen toisistaan. Rajana on sisäisten aluevesien ulkoraja eli ns. perusviiva, joka kulkee uloimpien saarten ja luotojen kautta. Sen ulkopuolinen alue aluemeren ulkorajaan  asti on "ulkomerta". Perusviivan sisäpuolella kaikki on "saaristoaluetta", joka rannikkomorfologian mukaan tarvittaessa jaoteltu pienempiin osiin, erityisesti Saaristomeren/Ahvenanmaan alueella. Jaon lähtökohtana on rannikon morfologia. Osa-alueiden rajat on vedetty saarien ja matalikoiden kautta niin, että alueet muodostavat rajautuneita vesialtaita. Merialuejako on verraten kaavamainen. Alueet on rajattu 1:50 000 merikartoille, joilta alueet on digitoitu aluevesirajaan. Aineisto on valmistunut 1995 ja sen jälkeen siihen on päivitetty aluevesirajojen muutokset.

Käyttötarkoitus: 
Käytetään ympäristöhallinnossa havaintotietojen kohdentamiseen tietyille merialueille.

Lisätietoja: 
https://geoportal.ymparisto.fi/meta/julkinen/dokumentit/Merialuejako.pdf

Vuonna 2023 julkaistu valuma-aluejako korvaa merialuejaon. Valuma-aluejaon kaikki 5 tasoa kattavat maa-alueiden lisäksi myös kaikki Suomen merialueet.
https://ckan.ymparisto.fi/dataset/valuma-aluejako1</gco:CharacterString>
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