High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Arwal is the administrative headquarters of Arwal district in the Indian state of Bihar. n March 2008 the Bihar government approved the construction of a bridge across the Son River at a cost of Rs. 100 crore from Arwal to Sahar in Bhojpur district. The economy of Arwal depends on agriculture only. Most of the population resides in villages and are farmers. The entire district is well irrigated due to the proper arrangement of canals. There is no existence of any industry or other business centre.