China, a communist nation in East Asia, is the worlds most populous country. Its vast landscape encompasses grassland, desert, mountain ranges, lakes, rivers and 14,500km of coastline. Beijing, the ancient capital, mixes modern architecture with historic sites including sprawling Tiananmen Square. Its largest city, Shanghai, is a skyscraper-studded global financial center. The iconic Great Wall of China fortification runs east-west across the country's north.