And he shall be like a tree planted by the rivers of waters, that bringeth forth his fruit in his season; and whatsoever he doeth shall prosper.

There is in Eden a sweet 
River of milk and liquid pearl
Nam'd Ololon,
on whose mild banks dwelt those
who Milton drove
Down into Ulro;
and they wept in 
long-resounding song
for seven days of Eternity,
and the River's living banks,
the mountains wail'd,
and every plant that grew,
in solemn sighs,
lamented...

Is this a river in Eden ?