Which of the following states is NOT included in the Ganga plain?

The correct answer is Assam . Key Points Assam is not a part of the Ganga Plain . The Ganga Plain mainly includes northern and eastern states of India associated with the Ganga River and its tributaries. The state of Assam is located in the northeastern region of India and is drained by the Brahmaputra River , not the Ganga River. The Brahmaputra River Basin is distinct from the Ganga River Basin in terms of geography, hydrology, and ecosystem. The northeastern location of Assam and its river system make it a separate geographical entity from the Ganga Plain. The geographical features of Assam include the Brahmaputra Valley , the hills of Karbi Anglong, and the Barak Valley, which are completely different from the flat alluvial plains of the Ganga region. Additional Information Uttar Pradesh Uttar Pradesh forms the largest part of the Ganga Plain . The Ganga and its tributaries such as the Yamuna , Ghaghara , and Gomti traverse through this state, making it agriculturally fertile. It is a key region for the growth of crops like wheat , sugarcane , and paddy . Haryana Haryana lies on the western edge of the Ganga Plain and is partially included in it. The Yamuna River, a significant tributary of the Ganga, flows through this state. The state is known for its fertile alluvial plains that support the cultivation of crops like wheat and rice . Bihar Bihar is a major part of the Ganga Plain. The Ganga River flows through the state, along with its tributaries like Kosi , Gandak , and Son . The region is known for its fertile soil, which supports agriculture as the primary occupation in the state.