mantelpiece

The fitting or decoration of a mantel—that is, the horizontal hood, cornice, or shelf carried above a fireplace; hence, by extension, all the marble-work, metal-work, or wainscoting around a fireplace, or masking the breast of a chimney, including usually one shelf or more.

Same as mantel.

A shelf that is affixed to the wall above a fireplace.

shelf that projects from wall above fireplace