Definitions of the Arctic

Arctic defined by vegetation zones

Map: Arto Vitikka, Arctic Centre, University of Lapland.
Conservation of Arctic Flora and Fauna. High and low Arctic terrestrial boundaries were defined by the Circumpolar Arctic Vegetation Mapping Project - Bioclimatic subzones. Sub Arctic boundary was defined by the Arctic Biodiversity Assessment (ABA).
10 C July Isotherm: USGS 2023.
Border data: Runfola, D. et al. (2020) geoBoundaries: A global database of political administrative boundaries. PLoS ONE 15(4): e0231866. https://doi.org/10.1371/journal.pone.0231866e.
Map created with QGIS.

The map can be freely used, provided the credits are mentioned.

Definitions by Arctic Council's working groups

Map: Arto Vitikka, Arctic Centre, University of Lapland.
AHDR: Arctic Human Development Report, four million people live inside this border.
AMAP: Arctic Monitoring and Assessment Programme.
CAFF: Conservation of Arctic Flora and Fauna
Border data: Runfola, D. et al. (2020) geoBoundaries: A global database of political administrative boundaries. PLoS ONE 15(4): e0231866. https://doi.org/10.1371/journal.pone.0231866e.
Map created with QGIS.

The map can be freely used, provided the credits are mentioned.