The document discusses several key geographic features of Southern and Eastern Asia. It describes several major rivers in the region including the Mekong River, Ganges River, Indus River, Huang He, and Yangtze River. It also discusses various seas and oceans that border the region such as the Indian Ocean, Bay of Bengal, Yellow Sea, South China Sea, and Sea of Japan. Additionally, it notes several mountain ranges like the Himalayas and Pamir Mountains and deserts such as the Taklimakan and Gobi Desert.