Final answer:
Siberia, which makes up 77 percent of Russia, is a vast region extending from the Ural Mountains in the west to the Pacific in the east, known for its extreme climate and plentiful natural resources.
Step-by-step explanation:
The country that has Siberia making up 77 percent of its territory, stretching from the Ural Mountains to the Pacific, is Russia. Siberia is an extensive region of Russia, characterized by its sparse population, harsh climate, and rich natural resources. This vast area is largely uninhabited, with only about 15 million people living across its expansive terrain, which is larger than the entire United States. Although known for its isolation and extreme weather, Siberia is also notable for its significant contribution to Russia's economy through its natural resources, including petroleum, natural gas, and forestry products. The Ural Mountains are considered the geographical boundary between Europe and Asia, and they contain valuable mineral resources that have historically supported Russia's growth and industrial development.