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The celebrated battle between the armies of Uthiyan Cheral Athan and Chozhan Karikaal VaLavan during the Sangam Age , c. 100 CE , was fought at Venni ( Sangam poem : Purananuru-66 ) in the outskirts of Nidamangalam , at the place where main Vennar river branches into three .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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