it is tundra
Greenland is the island located in the Arctic region but belongs to Denmark, which is outside the Arctic region. Greenland's large landmass and geographic location in the Arctic make it distinctive from other Arctic territories.
Anything north is Arctic, anything south is Antarctic.
That's pretty close to a definition of the adjective "Arctic".
The geographic feature that most likely prevented the spread of Islam farther south at one point was the vast Sahara Desert in North Africa. Its harsh climate and challenging terrain made it difficult for early Muslim armies to easily conquer and convert peoples living in the region.
Region
The northernmost mouth of a river in the U.S. is the mouth of the Tuktuk River, which flows into the Arctic Ocean in northern Alaska. This river is located near the village of Kaktovik, making it a significant geographic feature in the region. Its location reflects the extreme northern climate and the unique ecosystems found in Arctic environments.
The geographic feature primarily responsible for the lowest population on the map is likely a desert or mountainous region. These areas typically have harsh climates and difficult living conditions, which limit agricultural opportunities and access to resources. Consequently, they tend to support fewer inhabitants compared to more hospitable regions.
Location
Yes, because the Artic is a place and places are capitalised.
The last name Uriostegui is of Basque origin, with roots in the Basque region of Spain. It is a surname that is likely derived from a specific place name or geographic feature in the Basque Country.
I'm not sure are you talking about Lapland or Fennoscandia.
The area around the Earth's North Pole, and the small fox that lives there (Vulpes lagopex) is spelt arctic. In the UK, 'artic' is only really used as an abbreviation for articulated lorry.