I'm an expert in environmental sciences with a focus on biomes and their characteristics. When we talk about the tundra biome, it's essential to understand that it is one of the Earth's major biomes characterized by its cold, treeless landscape and a short growing season. The tundra biome is primarily found in the Arctic regions, which is why it is often referred to as the Arctic tundra. However, it also extends into some parts of the Antarctic, known as the Antarctic tundra.

The Arctic tundra is a vast expanse that stretches across the northernmost parts of the Earth, surrounding the Arctic Ocean. It is a harsh environment with permafrost, which is a layer of permanently frozen ground that prevents deep root growth and thus limits the types of vegetation that can survive. The Arctic tundra is known for its low biodiversity, with only a few hardy species of plants and animals adapted to its extreme conditions.

Now, let's delve into the countries that fall within the Arctic tundra biome. As mentioned, parts of the U.S. state of Alaska are within this biome. Alaska is the largest state in the U.S. and has a significant portion of its landmass in the Arctic tundra, characterized by its cold climate and unique flora and fauna.

Moving northward, Canada is another country that has a substantial area of the Arctic tundra. Canada's Arctic regions include the territories of Nunavut, Northwest Territories, and parts of Yukon. These areas are known for their vast, frozen landscapes and are home to indigenous peoples who have adapted to the harsh conditions for thousands of years.

Greenland, an autonomous territory within the Kingdom of Denmark, is almost entirely covered by ice, but its coastal areas feature the Arctic tundra. The tundra here is characterized by its rocky terrain and sparse vegetation, with a few hardy plant species and animal species like the Arctic fox and reindeer.

Iceland, while not as extensively covered by the Arctic tundra as some of the other countries mentioned, does have areas that fall within this biome. Iceland is known for its geothermal activity, which creates a unique environment where tundra vegetation can thrive despite the cold climate.

Norway also has regions within the Arctic tundra, particularly in the northern parts of the country where the climate is colder and the landscape is dominated by mountains and glaciers. The Svalbard archipelago, which is part of Norway, is entirely within the Arctic and features a tundra environment.

Lastly, Russia has the largest area of Arctic tundra of any country. The Russian Arctic includes vast regions of Siberia and the Far North, where the tundra stretches for thousands of kilometers. This area is home to a variety of wildlife, including polar bears, walruses, and various bird species.

It's important to note that while the Arctic tundra is the most well-known, there is also a subarctic tundra that exists in a transitional zone between the Arctic tundra and the boreal forest (taiga). This subarctic tundra can be found in parts of the countries mentioned, as well as in other regions where the climate is slightly milder than the true Arctic tundra.

In conclusion, the countries that are part of the Arctic tundra biome include the United States (Alaska), Canada, Greenland, Iceland, Norway, and Russia. These regions are characterized by their unique environmental conditions and are home to a variety of specially adapted plant and animal species. The preservation and study of these biomes are crucial for understanding global climate patterns and the impacts of climate change.

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The Arctic tundra -- that belt of the northern hemisphere that surrounds the northern polar cap but is not part of the arctic biome -- descends surprisingly far south. Parts of the U.S. state of Alaska and the countries of Canada, Greenland, Iceland, Norway and Russia are all in the Arctic tundra biome.read more >>