Sleeve M; Vinyl M. Watermark is the second studio album by Irish singer-songwriter Enya, released on September 19, 1988, through WEA Records. The album features a blend of new-age and Celtic music, characterized by Enya's layered vocals, synthesizers, and classical influences. It includes the massive hit single "Orinoco Flow," which topped the UK Singles Chart for three weeks and brought Enya international recognition.