What geographical disadvantages did Asia have?

- Vastness: Asia is the largest continent, covering about 30% of the world's total land area. This makes it difficult to transport goods and people, and to communicate across the continent.

- Mountain ranges: Asia is home to some of the world's highest mountain ranges, including the Himalayas, the Karakoram, and the Tien Shan. These mountains can be difficult to cross, and they can also create barriers to trade and communication.

- Deserts: Asia is home to some of the world's largest deserts, including the Gobi Desert, the Taklamakan Desert, and the Arabian Desert. These deserts can make it difficult to travel, and they can also create a harsh environment for people and plants.

- Rivers: Asia is home to some of the world's largest rivers, including the Yangtze River, the Yellow River, and the Ganges River. These rivers can be difficult to cross, and they can also cause flooding, which can damage crops and infrastructure.

- Climate: Asia has a wide variety of climates, from the tropical rainforests of Southeast Asia to the cold deserts of Central Asia. This can make it difficult for people to adapt to different climates, and it can also make it difficult to grow crops.