The term 'Platinum-Yielding Region' refers to the Ural Mountains, a mountain range in Russia that is known for its abundance of platinum. The Ural Mountains are located in the western part of Russia and stretch from the Arctic Ocean to the Ural River. They are also home to many other minerals, such as gold, copper, and iron ore. The Ural Mountains have been an important source of platinum since the 18th century, when it was first discovered in the region.