AP English Literature and Composition Question of the Day

On either side the river lie

Long fields of barley and of rye,

That clothe the world and meet the sky;

And thro' the field the road runs by

To many-tower'd Camelot;

And up and down the people go,

Gazing where the lilies blow

Round an island there below,

The island of Shalott.

What is the form of this poem?