Historically defined, the geographical orbit of Bengal (comprising present Indian state of West Bengal and the independent Republic of Bangladesh) witnessed the consolidation of human settlements of the historical phase from almost the middle of the first millennium BCE. It is from the third century BCE level that proper archaeological and epigraphic evidence from some parts of the region show the growth and expansion of large scale urban settlements.

中文翻译：

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项目报告：环境与生态变化：孟加拉早期铜版铭文的选集

从历史上讲，孟加拉国的地理轨道（包括印度西部的西孟加拉邦和独立的孟加拉国共和国）从公元前第一个千年中期就见证了历史阶段人类住区的巩固。从公元前三世纪开始，该地区某些地方的考古和人口学证据就表明了大规模城市居住区的增长和扩展。