This is the island of Rugen; it is the largest island of Germany in the Baltic Sea.
and famous for its chalk cliffs.
Caspar David Friedrich married Christiane Caroline Bommer, who was about 20 years his junior. On their honeymoon in July and August 1818, they visited relatives in Neubrandenburg and Greifswald. From there, the couple undertook an excursion to the island of Rügen with Friedrich's brother Christian. The painting appears as a celebration of the couple's union.
How I wonder what you are!
Up above the world so high,
Like a diamond in the sky.
When the blazing sun is gone,
When he nothing shines upon,
Then you show your little light,
Twinkle, twinkle, all the night.
Then the traveller in the dark
Thanks you for your tiny sparks;
He could not see which way to go,
If you did not twinkle so.
In the dark blue sky you keep,
And often through my curtains peep,
For you never shut your eye
'Till the sun is in the sky.
As your bright and tiny spark
Lights the traveller in the dark,
Though I know not what you are,
Twinkle, twinkle little star.
by Jane Taylor, 1806
First published as " The Star"