LIMA (Reuters) -Peru's government has abandoned a plan that reduced the size of a protected area around the country's ancient Nazca Lines, it said on Sunday, after criticism the change made them vulnerable to the impact of informal mining operations. Peru's Culture Ministry in a statement said it was reinstating with immediate effect the protected area covering 5,600 square kilometers (2162.17 square miles), that in late May had been cut back to 3,200 square kilometers.