picture rail 
noun
A horizontal strip of wood on a wall from which pictures can be hung.There is also ornate cornicing in this room, depicting flowers, along with a picture rail and a dado rail....
- We decided that we'd be immensely bold and go for a lovely deep red colour for the walls and that everything above the picture rail, including the ceiling, would be gold.
- Double doors lead through to the dining room, which also has ceiling cornicing, a picture rail and a mahogany fireplace, as well as a fitted storage cupboard.