<P> The districts of Kolkata and North 24 Parganas form mature delta region . The rivers are slow and meandering and frequently shift their courses . Swamps, beels and oxbow lakes characterises the scenery . The district of South 24 Parganas is known to be the active delta of the Ganges, where the formation of delta is still an ongoing process . </P> <P> Depending on soil and climate variations, West Bengal can be divided into six broad divisions: </P> <Ul> <Li> The hill region in the north </Li> <Li> The terai and Teesta alluvial region of North Bengal </Li> <Li> The laterectic, red and gravely undulating region in the west </Li> <Li> The coastal alluvial region in the south </Li> <Li> The gangetic alluvial region in the west </Li> <Li> The Vindhya alluvial region in the centre </Li> </Ul> <Li> The hill region in the north </Li>

What is the north south extension of west bengal