the North Sea
the Pacific (Ocean)
the Red Sea
the South Seas
the Bay of Biscay
the Gulf of Lions
the Gulf of Mexico
the (Persian) Gulf
the Hudson Bay
the roaring forties
the Strait of Gibraltar
slime
to silt up
a lake
the lakeside
a pool
a pond
a waterfall
a cascade
a whirlpool
rapids
a ford
to ford
a dyke
a ditch
fresh water
clear
fast-flowing, swift-flowing
slow
winding
narrow
broad
deep
shallow
to wind
meanders
to meander
to ripple
a ripple
the Atlantic (Ocean)
the Baltic (Sea)
the Black Sea
the Carribean
the Caspian Sea
the (English) Channel
the Dead Sea
the Irish Sea
the Indian Ocean
the Mediterranean (Sea)
a river
by the riverside
the (river) bank
the bed of the river, the riverbed
the (rate of) flow
the stream, the current
against the stream
upstream
downstream
a spring
a source
this river has its source / springs up in the Alps
a brook, a stream, a creek (am)
a creek
a tributary
a torrent
the watershed (br), the divide (am)
mud
muddy
silt