Explanation:

The Subarnarekha River flows through the Indian states of Jharkhand, West Bengal and Odisha.As per tradition, gold was mined near the origin of the river at a village named piska near Ranchi. This is why it was named Subarnarekha, meaning "streak of gold". Legend has it that traces of gold were found in the river bed. Even now, people look for traces of gold particles in its sandy beds. The name is a combination of two words meaning gold and line/ streak in Indian languages.