See: [[rc://en/ta/man/translate/writing-poetry]] and [[rc://en/ta/man/translate/figs-parallelism]]

## A psalm of David ##

“This is a psalm that David wrote.”

## and its fullness ##

"and everything that fills it"

## For he has founded it upon the seas and established it on the rivers ##

AT: For he formed its foundation on the seas and built it on the deep waters"

## the seas ... the rivers ##

These phrases are used together to refer to the huge deep ocean below the earth.