The GIS Division of NIC, Tamil Nadu State Unit has placed various maps of Tamil Nadu on the web which is accessible with the URL http://chennai6.tn.nic.in/tngis This website has base maps for all the Districts, Revenue Divisions, Taluks and Blocks of Tamil Nadu, prepared in coordination with GIS Division of NIC HQ and updated to include the details relating to the new districts, taluks and blocks. Detailed taluk level maps with 6 layers are also available for three districts, namely Thanjavur, Thiruvarur and Nagapattinam. The site offers chloropleth thematic maps based on Census ’91 data taking into account the new districts that were formed since 1991. The thematic maps are at State and District levels. This web site hosts more than 250 maps with different levels of boundaries and themes.