"Watermark" is a 1988 album by which of these singers?

"Watermark" is the second studio album by Irish singer, songwriter and musician Enya, released on 19 September 1988 by WEA.

The album peaked at number 5 on the UK "Albums Chart", number 25 on the "Billboard" 200 in the United States, and reached number 1 in New Zealand and Switzerland. It was certified quadruple Platinum by the British Phonographic Industry (BPI) and the Recording Industry Association of America (RIAA) for shipments of 1.2 million and 4 million copies across the United Kingdom and the United States, respectively.

The main single released from the album was "Orinoco Flow", which spent three weeks at number 1 in the United Kingdom. At the 32nd "Grammy Awards" in 1990, "Orinoco Flow" was nominated for "Best New Age Performance" and "Best Music Video".

Eithne Pádraigín Ní Bhraonáin (born 17 May 1961), known mononymously as Enya, is an Irish composer and singer-songwriter. The music of Enya is widely recognised for featuring multi-layers of her vocals, varied instrumentation, lengthened reverb, and subtle Celtic elements. Her career as a solo artist, now over four decades long, is notably an atypical path to success in the music industry. As the second-best-selling Irish music act overall, after rock band U2, Enya is the best-selling Irish solo artist; believed to have sold over 80 million albums worldwide.