The 3 largest rivers in South Asia are:
1.The Yangtze River
The Yangtze River is the longest river in China and the third longest in the world, measuring an impressive 6,380 kilometres in length. Steeped in myth and legend, vertical limestone cliffs line the river as it rises up to the mountains of Tibet.
2. The Mekong River
The Mekong River is an important source of water in Southeast Asia, measuring 4,350 kilometres in length. The river flows from the Tibetan Plateau through China, Myanmar, Laos, Thailand, Cambodia, and finally, Vietnam.
3.Brahmaputra River
One of Asia’s major rivers, the Brahmaputra River flows through China, India and Bangladesh. The river originates in the Tibetan Himalayas and travels almost 2,900 kilometres in length.
I don't know if you have options. But that much population growth would also increase many economic problems such as starvation, pollution, crowding, droughts, etc.
The three rivers shown are the Volga 1, Ob 2 and Lena 3 all in Russia and the Danube is not shown because it is not in Russia but flows in behind the Adriatic Sea over to Germany and so is in a different part of Europe though all 4 rivers are major rivers in Europe.
It take the world one year to make a revolution around the sun.
