Wind Surfers in the Harbor - 2

This is the second shot I got of 2 backlit wind surfers. The sun was

low in the sky right behind them. I was testing my new Nikkor zoom.

The film was Polaroid High Definition 400 from Wal-Mart. It's made

by Agfa, but nobody seems to know if it's Vista or an older film.

Note that this is a COLOR film.

I like this picture very much. Very abstract mood, very nice exposure. What is the black line in the upper part of the picture?

The black line is a thin strip of land that protects one side of the harbor.