in 2007, it was estimated that naxalites were active across "half of the india's 28 states" who account for about 40 percent of india's geographical area, an area known as the "red corridor", where according to estimates they had influence over 92,000 square kilometers. in 2009, naxalites were active across approximately 180 districts in ten states of india in august 2010, karnataka was removed from the list of naxal-affected states in july 2011, the number of naxal-affected areas was reduced to (including proposed addition of 20 districts) 83 districts across nine states.