West Bengal Chief Minister Mamata Banerjee on Thursday renamed six townships in the State, officials said. Of them, Siliguri will be known as Teesta, a major river in North Bengal, and Bolpur as ‘Gitabitan’, a popular compilation of songs of Rabindranath Tagore. The twin industrial towns of Asansol-Durgapur will be known as ‘Agnibina’, a collection of poems by poet Kazi Najrul Islam. Gajaldoba in Malda district has been rechristened as 'Mukta Tirtha' while Garia near this metropolis will become 'Uttam City', after the late matinee idol Uttam Kumar, the officials said. Banerjee renamed Kalyani, in Nadia district developed during the time of Bidhan Chandra Roy's chief ministership, as ‘Samriddhi’.