Asia is the largest continent, covering approximately 44.58 million square kilometers (17.21 million square miles), which accounts for about 30% of the Earth's total land area. Home to over 4.6 billion people, Asia is also the most populous continent, housing diverse cultures, languages, and landscapes. It includes 49 countries, with China and India being the two most populous nations globally. Asia is characterized by its vast geographic diversity, comprising mountains, deserts, plains, and rivers. Major geographic landmarks include the Himalayas, the Gobi Desert, and the Indian subcontinent, showcasing its rich environmental and cultural heritage.