Consider the following statements:

1.The Brahmaputra river is known as Tsangpo in its upper reaches in Tibet.

2.The Godavari river is often referred to as the Ganges of the South.

3.The Krishna river has the second-largest river basin in India, after the Ganges.

4.The Indus river originates from the Tibetan plateau, near Lake Mansarovar.

Which of the statements above is/are correct?