We turned left onto it, through an undulating sea of purple heather up to Golden Heights.

Old, almost primitive-looking fishing boats bobbed peacefully on undulating seas of midnight blue.

Nothing lay ahead but an undulating sea of pale green grass.

But this undulating sea of people, these faces, are not part of some joyous unanimity.

It's an undulating sea of hostas in so many forms, shapes and colors that the mind balks at listing them.

Inside the park I was soon looking out over an undulating sea of tree tops, broken only by a few stony outcrops.

The plateau stretched before them, an undulating sea of grassy dips and hollows.

The four of us hung on in silence and rode the undulating sea.

He fought his way ahead, unable to do anything else, adrift in an undulating sea of green.

A white-painted sign, white foam on the undulating sea of the corrugated fence.