List of Wildlife sanctury in Tamilnadu

Grizzled Squirrel Wildlife Sanctuary
Indira Gandhi Wildlife Sanctuary and National Park
Kalakkad Mundanthurai Tiger Reserve
Kanyakumari Wildlife Sanctuary
Megamalai Wildlife Sanctuary
Palani Hills Wildlife Sanctuary and National Park
Point Calimere Wildlife and Bird Sanctuary
Point Calimere Wildlife Sanctuary
Vallanadu Wildlife Sanctuary

List of Waterfalls in Tamilnadu

Agasthiar Waterfall
Agaya Gangai  Waterfall
Aintharuvi  Waterfall
Amirthi Waterfall
Anju Veedu  Waterfall
Ayyanar Waterfall 
Bamen Waterfall
Bear Shola Waterfall
Catherine Waterfall
Chinnakallar Waterfall
Chitraruvi   Waterfall
Elk Waterfall
Fairy Waterfall
Gaur Vellaiyan Waterfall
Glen Waterfall
Halashana Waterfall
Hogenakal Falls 
Jalagamparai Waterfalls 
Kalhutti Waterfall
Kalikesam Waterfall
Karteri Waterfall
Kiliyur Waterfall
Kolakambai Waterfall
Koraiyar Waterfall
Kovai Kutralam   Waterfall
Kumbakkarai Waterfall
Kutharapaanjan Waterfall
Kuthiraiyar Waterfall
Kutladampatti Waterfall
Kutralam Waterfall
Law’s Fall Nilgiris  
Mangalam Aruvi Waterfall
ManimutharWaterfall
Mayil Uthu Waterfall
Milk Waterfall
Monkey Waterfall
Neptune Waterfall
Paalaru Waterfall
Palaruvi  Waterfall
Pambar Waterfall
Papanasam Waterfall
Pazhathotta Aruvi   Waterfall 
Pazhaya Courtallam   Waterfall 
Peraruvi Waterfall 
Periyar Waterfall
Poombarai Waterfall
Pudur Megan Waterfall
Puli Aruvi Tiger Waterfall
Puthu Aruvi   New Waterfall
Pykara lower Waterfall
Pykara upper Waterfall
Sengupathi Waterfall
Shenbaga Devi Waterfall
Shenbagathoppu Waterfall 
Silver Cascade Dindigul Waterfall 
Siruvani Waterfalls   
Skamba Waterfall
Snake Waterfall
Suruli Waterfall
Thakkam thootam Waterfall  
Thalaiyar Waterfall
Thenaruvi honey Waterfall
Thirumoorthy Waterfall
Thiruparappu Waterfall
Thoovanam Waterfall
Ullakarvi Waterfall
Vaana Theertham Waterfall 
Vaideki Waterfall
Vattaparai Waterfall 

List of Trekking & Camping in Tamilnadu

Anamalai Hills Trekking & Camping
Beach Walks Trekking & Camping
Elagiri Hills Trekking & Camping
Kalakkadu – Mundathurai  Trekking & Camping
Kodaikanal – High In Kodaikanal Trekking & Camping
Kolli Hills Trekking & Camping
Monkey Fall Trek  Trekking & Camping
Ooty Trekking & Camping
Udhagamandalam Trekking & Camping

List of Temples in Tamilnadu

Ashtabujam Temple
CHIDAMBARAM Temple
Ekambaranathar Temple 
Guganathaswamy Temple 
GURUDWARA  Temple
Jain Temple,Thiruparankundram
Kailasanathar Temple
Kamakshi Amman Temple
Kanchi Kamakoti Peetam Math.
KANCHIPURAM
Kanyakumari Temple
Kapaleswar Temple 
Kumarakottam Temple
KUMBAKONAM Temple
MAHABALIPURAM Temple
MaruthamalaiTemple
Mathangeswarar Temple
Meenakshi Temple
Muktheeswarar Temple
Murugan Temple
Perur Temple
Rameshwaram Temple
Shree Meenakshi Sundareswarar Temple
Sri Parthasarathy Temple
Swamimalai Temple
TANJAVUR Temple
The Nataraja Temple 
TRICHY (TIRUCHIRAPALLI) Temple
Ulagalanda Perumal Temple
Vaikunta Perumal Temple
Varadarajaswami Temple
Velankanni Temple

List of Rivers in Tamilnadu

Adyar River 
Amaravati River 
Arasalar River 
Bhavani River 
Chittar River 
Coonoor River 
Gingee River 
Gomukhi River 
Kabini River 
Kallar River 
Kamandal River 
Kaveri River 
Kedilam River 
Kollidam River 
Kudamurutti River 
Kundha River 
Malattar River 
Manimuktha River 
Manimuthar River 
Mayura River 
Moyar River 
Noyyal River 
Pachaiyar River 
Pahrali River 
Palar River 
Pambar River 
Parambikulam River 
Ponnaiyar River 
Pykara River 
Sankaraparani River 
Shanmuganadhi River 
Sigur River 
Siruvani River 
South Pennar River 
Tambaraparani River 
Thamirabarani River 
Thenpennai River 
Tondiar River 
Uppar River 
Vaigai River 
Vaniyar River 
Vennaaru River