The Climate-Ecological Observatory for Arctic Tundra (COAT) platform covers two sites in the Norwegian terrestrial arctic - low-arctic Varanger Peninsula and high-arctic Svalbard. Long-term monitoring and research on tundra ecosystems are conducted on these sites.

COAT Varanger is a subsite under the COAT platform located mainly on the Varanger penninsula in the low arctic. Long-term monitoring and research on tundra ecosystems are conducted on this site.

COAT Svalbard is a subsite under the COAT platform located on the Svalbard Archipelago in the high Arctic. Long-term monitoring and research on tundra ecosystems are conducted on this site.