Heath is open land with low growing grasses and plants. If you travel to England, you can drive out in the countryside to see the heath that you've read about in novels.
An open, sandy field of low shrubs and scrubby plants like gorse and heather is called a heath. Another word for this kind of uncultivated countryside is moor. A particular evergreen shrub is also called a heath; it's a low-growing plant with purplish flowers that commonly grows on, you guessed it, a heath. The Old English root of heath is the word hǣth, which means "wasteland."