The population density is a measurement of population per unit area or unit volume. In Figure 6.1 (b), the population density is unevenly distributed:
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The northern-most areas like Jammu and Kashmir and the northeastern states like Sikkim and Arunachal Pradesh have the least population density.
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The northern stretch from Punjab to West Bengal has the highest population density.
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The central, western and northeastern states have a moderate population density.
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Southern states like Kerala and Tamil Nadu also have a high population density