The Brahmaputra Valley region has a unique landscape, with the Brahmaputra River and other rivulets running between the parallel hill ranges. The valley gets flooded during the monsoons, which deposit a large amount of silt and debris on the riverbeds.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/probable-agricultural-biodiversity-heritage-sites-india-brahmaputra-valley-region
[2] http://admin.indiaenvironmentportal.org.in/category/author/anurudh-k-singh-0
[3] http://admin.indiaenvironmentportal.org.in/category/journal/asian-agri-history
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brahmaputra-valley
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rice
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/legumes
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vegetables
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tea
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/spices
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/horticulture
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fodder
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sedimentation
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[17] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[18] http://admin.indiaenvironmentportal.org.in/category/thesaurus/plant-biodiversity
[19] http://admin.indiaenvironmentportal.org.in/category/thesaurus/assam