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| Subject | English | Basque |
| environ. | Arctic ecosystem | ekosistema artiko |
| environ. | Arctic Ocean The smallest and most poorly studied of the oceans on earth. It covers an area of 14 million square km that is divided by three submarine ridges, i.e. the Alpha Ridge, the Lomonosov Ridge, and an extension of the mid-Atlantic ridge. It is also nearly landlocked, covered year-round by pack ice, and the third of its area is continental shelf | Ozeano Artiko |
| environ. | Arctic region The northernmost area of the earth, centered on the North Pole, that includes the Arctic Ocean, the northern reaches of Canada, Alaska, Russia, Norway and most of Greenland, Iceland and Svalbard | eskualde artiko |