The tributaries of river Thamirabarani are:
i) Karaiyar
ii) Manimuthar
iii) Ramanathi
iv) Servalar
v) Gadananathi
vi) Chittar
vii) Pachaiyar

Pamban, Hare Krusadai Nallathanni Theevu, Pullivasal, Srirangam, Upputanni, Island Grounds, Kattupalli Island, Quibble Island and Vivekananda Rock Memorial are some major islands of Tamilnadu.

The sand dunes formed along the coast of Ramanathapuram and Thoothukudi districts are called Teri.

Tamilnadu is bounded by the Bay of Bengal in the east
i) Kerala in the west
ii) Karnataka in the northwest
iii) Andhra Pradesh in the north
iv) Indian Ocean in the south.

a) Under the terms of the Carnatic Treaty 1801, the British assumed direct control over Tamilagam
b) The Palayakkarar system came to an end with the demolition of all forts and disbandment of their army

The following are the chief characteristics of a successful cluster:
i) Geographical proximity of Small and Medium Enterprises (SMEs)
ii) Sectoral - Specialisation
iii) Close  inter-firm collaboration
iv) Inter-firm competition based on innovation
v) A socio-cultural identity which facilitates trust
vi) Multi skilled workforce.
vii) Active self-help organisations,
viii) Supportive regional and municipal governments.

1. The river Cauvery originates at Talakaveri  in the Kodagu district of Karnataka in the Western ghats.
2. It forms Hogenakkal waterfalls in Dharmapuri District.
3. Mettur dam is located across the river in Salem district.
4. A tributary called Bhavani joins Cauvery on the right bank.
5.Two more tributaries Noyyal and Amaravathi confluence Cauvery at Thirumukkudal and this
region is called "Agandra Cauvery".
6. In Tiruchirapalli district, the river branches into two parts. The northern branch is called Coleroon or Kollidam and the southern branch remains the Cauvery. These two again join to form Srirangam Island.
7. Kallanai has been constructed across the Cauvery.
8. The delta of Cauvery in the coast is called as the 'Garden of South India'.
9. It merges into Bay of Bengal to the south of Cuddalore.

i) In June 1801 Marudhu Pandiyars issued a proclamation of Independence which is called Tiruchirappalli Proclamation.
ii) Chinna Marudhu collected nearly 20,000 men to challenge the English army.
iii) British reinforcements were rushed from Bengal, Ceylon and Malaya.
iv) The rajas of Pudukkottai, Ettayapuram and Thanjavur stood by the British.
v) Divide and rule policy followed by the English spilt the forces of the Palaykkarars soon.
Fall of Sivagangai :
i) In May 1801, the English attacked the rebels in Thanjavur, Thiruchirappalli, Piranmalai and Kalayarkoil.
ii) They were again defeated by the forces of the English.
iii) In the end the superior military strength and the able commanders of the English Company prevailed
iv) The rebellion failed and Sivagangai was annexed in 1801.
Outcomes:
i) Marudhu brothers were executed in the fort of Thirupathur.
ii) Oomathurai and Sevathaiah were captured and beheaded.
iii) Seventy three rebels were exiled to Penang in Malaya.
iv) The palayakkarars fell to the English. The rebellion was suppressed
v) It led to the liquidation of all local chieftains of Tamil Nadu.
vi) The Carnatic Treaty was signed.
vii) The palayakkarar system came to an end in Tamil Nadu.