Passage: A thin strip between the foothills of the Himalayas and the plain, the Bhabar is a region of porous ground consisting of boulders and pebbles that have washed down from the mountains.  It is not suitable for crops and is forested.  The streams disappear underground here.Below the Bhabar lie the grasslands of Terai and Dooars.The many tributaries of the Indus and Ganges divide the plain into doabs, tongues of land that extend to where the tributaries meet.  Close to the rivers is khadar land of new alluvium that is subject to flooding. Above the flood limit, bangar land is older alluvium deposited in the middle Pleistocene.The annual rainfall increases from west towards the east.  The Lower Ganges Plains and the Assam Valley are more verdant than the middle Ganga plain. The lower Ganga is centered in West Bengal, from which it flows into Bangladesh. After joining the Jamuna, a distributary of Brahmaputra, both rivers form the Ganges Delta. The Brahmaputra rises in Tibet as the Yarlung Zangbo River and flows through Arunachal Pradesh and Assam, before crossing into Bangladesh.

Question: Which area is not as green compared to the Assam Valley?
the middle Ganga plain