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The important ports include Chennai , Thoothukkudi , Nellore , Ennore and Nagapattinam , which take advantage of their close proximity with regions rich in natural and mineral resources and good transport infrastructure .
 Chennai, Thoothukkudi, Nellore, Ennore, Nagapattinam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chennai, Thoothukkudi, Nellore, Ennore, Nagapattinam