Linked from
The 20 pages that link to Alluvium, each with the reason it gives.
SedimentBroader topic: It is a river-deposited subset of sediment.
Alluvial plainBroader topic: Repeated deposits of alluvium build the plain’s surface.
Indo-Gangetic PlainBroader topic: River-borne alluvium forms the plain’s extensive surface deposits.
NaturalBroader topic: Alluvium is a common natural deposit beneath or between occupation layers.