Iran is 4.4 times larger than Japan.
Area: 1,648,195 km2 World Factbook
Population: 80,840,713 (July 2014) World Factbook
Iran, also known as Persia, officially the Islamic Republic of Iran, is a country in Western Asia. Wikipedia
Area: 377,915 km2 World Factbook
Population: 127,103,388 (July 2014) World Factbook
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south. Wikipedia