In 1998, 11.72 sq kilometres of hill slopes in and around Vizag were occupied by houses and various other constructions.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/unauthorised-hill-slope-occupation-environmental-hazard
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-visakhapatnam
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vishakhapatnam-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-security
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/floods
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deforestation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/smart-city
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/flora
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fauna
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-health
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment