Statement 1 is Incorrect: The Brahmani river is formed by the confluence of the Sankh and South Koel rivers near Rourkela; these headstreams originate in the Chota Nagpur Plateau of Jharkhand, not the Eastern Ghats.

Statement 2 is Correct: The Nagavali river (also known as Langulya) originates in the Eastern Ghats near Lakhbahal in the Kalahandi district of Odisha.

Statement 3 is Incorrect: The Subarnarekha river originates in the Chota Nagpur Plateau near Ranchi in Jharkhand and flows through West Bengal and Odisha before entering the Bay of Bengal.

Statement 4 is Correct: The Vamsadhara river originates in the Eastern Ghats near Lanjigarh in the Kalahandi district of Odisha and flows through Andhra Pradesh before joining the Bay of Bengal.