Japan is 4.1 times larger than Portugal.
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
Area: 92,145 km2 Wikipedia
Population: 10,459,806 (2,013) World Bank
Continental Portugal or Mainland Portugal is the part of the territory of Portugal located in the Iberian Peninsula and so in Continental Europe. Continental Portugal is also commonly referred to - by the Portuguese - simply as the Continent. Wikipedia