This is the Chinese tale of the four rivers:
What is the story behind the Chinese Dragon and the Rain? (Something about them invoking the rain or what not)
And if anyone has any more interesting information, legends myths, stories please share them.
Long ago China was a country with no rivers. It was a land dependent upon rain and to it's east was the great Eastern Sea. There lived in the Eastern Sea four dragons known as: the Long Dragon, the Yellow Dragon, the Black Dragon and the Pearl Dragon. They were creatures of the sea but were not bound by the sea as they often played within the clouds. One day as they were frolicking in the clouds high above the earth the Pearl Dragon heard some commotion down on the earth and called the other dragons to see what was going on. The saw the villagers praying for rain and the land was becoming dry and their crops were dying. The dragons felt sorry for the humans and deceided to ask the Emperor of Heaven to send the people rain.
The Emperor of Heaven lived in the Heavenly Palace and was not concerned about human affairs.
The Long Dragon flew up to the palace and requested to meet with the Emperor of Heaven. The Emperor of Heaven agreed to hear his request.
After submitting his request on behalf of the humans the Long Dragon left the palace confident that rain would be sent to the poor villagers.
The four dragons went back to their frolicking within the clouds happy that they were able to help the villagers.
While flying in the clouds the dragons heard cries of sorry from the villagers and went to see what was going on.
They found that the crops had dried up and the people were dying of starvation. Horrified by what they saw the four dragons deceided to scoop up water in their mouths from the sea and spray it down towards the earth.
They did this and the crops soon began growing and the people were happy.
The Emperor of Heaven was not happy when he heard what the dragons did and ordered the God of the Mountains to lift his mountains in the air and crush the dragons. The God of the Mountain obeyed and crushed the dragons one by one.
Being creatures of water the bodies of the dragons turned into rivers and allowed the humans to farm and survive.
The Black Dragon became the Heilongjian River in the north, the Yellow Dragon became the Huanghe river in central China, the Long Dragon became the Chanjian (Yangtze or long river) in the south and the Pearl Dragon became the Zhujian river in the far south.