A name given to a part of the river
which flows from the east of Anotatta, before it ultimately divides into the
five great rivers, Gangā,
The Ummagga-Gangā is the continuation of
the Bahala-Gangā and flows for sixty leagues under the earth, till it reaches
the rock named Vijjha. SnA.ii.439; AA.ii.760; UdA.302.