Final answer:
The grape variety Tannat is known by the same name in France and Uruguay, but it's also referred to as Harriague in Spain.
Step-by-step explanation:
The grape variety Tannat is known by different names in various countries. In France, it is primarily known as Tannat, which is the original name of the grape since it originates from the Basque region, mainly used in the Madiran AOC. However, it may also be referred to locally by its related clones or variations. In Spain, particularly in the Basque region, the grape is often referred to as Harriague which is another synonym stemming from its historical cultivation. Lastly, in Uruguay, Tannat has made quite a name for itself and is commonly referred to by the same name, Tannat, and has become the national grape of the country known for producing rich, robust red wines with notable tannins.