N ature provides everything that we need to survive. It nourishes us. Hence, we call it Mother Nature. Our earth is awesomely decorated by the beauty of nature. But beyond the beauty, we can not deny the unexpected and unstoppable power of nature. Nature has surprised us with its many wonders throughout the history. The natural disasters and the massive loss caused by them are enough to inculcate the potentiality of mother nature. The human being has conquered almost everything on this earth but dealing with the power of nature is beyond imagination. Leonardo da Vinci said that water is the driving force of all nature. The rivers have been an excellent source of trade and transport since human existence. Despite the benefits, the natural threat is manifested in some of the many rivers around the globe. Rivers carry high risks, the floodings, storms, cyclones, etc. are disastrous for humans and other species. There are 76 rivers around the world over the length 1000 miles. Among the longest and deepest rivers, these are counted as the most dangerous.
Yangtze with the length 6,300 kilometers is the longest river in Asia and the third longest in the world. It plays the biggest role in China's economy as it provides water for hydro-electricity, sanitation, irrigation, transportation, industry etc. The massive flooding of Yangtze in 1954 took an estimated 33,000 lives including the deaths of plague in the aftermath of the calamity. Large number people die due to the periodic flood in Yangtze river. Recently on 1 June 2015, a cyclone hit a ship on Yangtze and around 400 people are thought to have died. In 2012, a part of the river in Chongqing turned red. The cause of coloring of the river remains not clear, but officials said the blooding caused by illegal dumping.
Congo River is the world's deepest river having a depth of 220 m. The length of 4,370 km made Congo the ninth longest river in the world. The river flows across the ten countries of the continent and it is the strongest source of hydro-power. Besides the benefits provided by Congo, the rain forests attached with the river is said as the source of hazardous plagues. The area is also the habitat of dangerous pygmies and cannibals. Polish author Joseph Conrad called Congo as ''Heart of Darkness'' publishing a book about a voyage up to the river.
Amazon is the world's second longest river after Nile with total length 6751 km. The river in average discharges 209,000,000 liters water per second. Amazon includes a large number of aquatic beasts, being a huge risk for the human. The Amazon basin covers about 40% of South America. It is the shelter of thousands of flora and fauna. Two thousand varieties of plant species exist here, enriched with high-quality wood, hence it is called "lungs of the earth".
The Orinoco with the length 2,140 km is one of the largest and longest rivers in the continent. The river is bordered by extremely dense and lush rainforests. Orinoco and its tributaries are the major transportation systems for the parts of Venezuela and Colombo. The prevalent flooding and the waterfalls create difficulty in the livelihood of people around the river.
Mekong river is also called the ''mother of waters''. The length of the river is estimated 4,350 km which passes through the countries Laos, China, Burma, Thailand, Cambodia and Vietnam. This has been a major trading route for these nations. The extreme seasonal variations in the flow not only cause a navigational problem, but the flooding takes the lives of local people dwelling around the region. In 2008, Mekong experienced the worst flood resulting the massive damage of $66 million and several deaths as well.
Yenisei flows through Russia and Mongolia. Yenisei has length 5,539 km with the maximum depth 24 metres. The river is dangerous due to the high level of toxicity and radiation. Aquatic scientists have proved that the river is badly contaminated by the decades of pollution. Yenisei suffers from the radioactive discharges from the factories harming the people dwelling around it.
The largest river in North America is Mississippi with a length of 3,734 km. Despite the number of benefits provided by the river to the American states, the river and its tributaries have caused a devastating loss to the mankind. The history of Mississippi includes dozens of floods. In 2011, US faced the largest and the most damaging Mississippi flooding.
The Southern end of Parana extremely carries the risk of uncontrollable flooding and water currents. Having the length 4,880 km, Parana and its tributaries create a big watershed throughout the continent. But, the periodic flood erodes shores and villages displacing the huge populations.
The total 2,900 km of Brahmaputra flows through Bangladesh, China and India. It sustains million of lives as the river is mostly used for transportation and irrigation purposes. Despite all these, the catastrophic flooding is the main threat to the people who live nearby. During the spring season, floods, soil erosion and other occurrence are common. They cause enormous losses to lives, crops and property. The flood issue in Brahmaputra remains unsolved even many efforts are made to minimize the loss since long.
Lena (4,472 km) is the 11th longest river in the world. During the spring season, Lena emerges so vulnerably. In 2007, the over-flooded Lena swallowed twelve towns, resulting the vast damage.