Which river forms the boundary between the Indian states of Uttar Pradesh and Bihar near Chausa before meeting the Ganga?

💡 Solution & Explanation

The Karamnasa River originates in the Vindhyan Range in Uttar Pradesh and flows through Bihar, forming part of the boundary between the two states before its confluence with the Ganga near Chausa. Other rivers like the Son and Ghaghra meet the Ganga at different locations without serving this exact boundary function near Chausa. Chausa is also renowned in medieval history as the site of the 1539 battle between Sher Shah Suri and Humayun.