S
ConfluenceW
Confluence
DistributaryW
Distributary
A
Ice circleW
Ice circle
River mouthW
River mouth
B
River mouthW
River mouth
Proglacial riverW
Proglacial river
C
River rejuvenationW
River rejuvenation
River forkW
River fork
D
River sourceW
River source
Slough (hydrology)W
Slough (hydrology)
E
Source of the Amazon RiverW
Source of the Amazon River
Source of the DanubeW
Source of the Danube
F
TributaryW
Tributary
Water gapW
Water gap