chennai is surrounded by Coovam river , really stinking and breed for various insects, all over the city this river isrunning, adjoining places ofthis riverinside city you can see full of mosqitos , and people urinate wherever possible, and the new contractor cleaning thewate material is not doing a good job, so many road side restrarant spoiling the city , better to go out of city ifyou want clear air andwater , a lot of fly over has to come if you want to deconjust