The RW systems of South Asia are important for food security
of the region (Timsina and Connor, 2001), and for the livelihoods
of the many millions of farming families and others employed in
aspects of the value chain. Most of the RW area is located on the
Indo-Gangetic Plains (IGP), with 10 Mha in India, 2 Mha in Pakistan,
0.5 Mha in each of Nepal and Bangladesh. The two small north-west