12.49417 80.15802 7 Asia/Kolkata Tamil Nadu 17 21st Street 21st Street 603102 Tamil Nadu IN Kalpakkam India 12.49420 80.15800 0.004 1 Kalpakkam IN Tamil Nadu Tamil Nadu Tamil Nadu India 603102 17 21st Street 12.49420 80.15800 0.004 1 INVAS-KEJVI PUDNAM-KEJVI 4856398272942 6 administrative Tirukalukundram boundary 55 administrative Chengalpattu district boundary 66 administrative Tirukalukundram boundary 21st Street 24th Street 12.49387 80.15777 0.044 Kalpakkam Tamil Nadu 603102 17 21st Street 12.49420 80.15800 Pudupattanam Tamil Nadu 603102 17 21st Street 12.49420 80.15800