Radisson SAS plans to open the 158-room Farnham Estate Health Spa in Cavan, Ireland, in June.
The 10m euro (£7m) 40,000sq ft (3,700sq m) health spa will comprise 19 wet and dry treatment rooms and a relaxation room with waterbeds.
A trilogy suite for three-in-one treatments for one to two guests will feature three hydrotherapy baths, two aroma stream baths, a mud Serail bath, two dry floats and three Tatami beds.
A thermal suite will include a Laconium, a Finnish-style sauna, an aroma stream bath, an amethyst grotto, an ice fountain, a Kneipp walkway, reflexology foot basins and snail showers.
An indoor/outdoor infinity swimming pool will feature hydrotherapy and massage jets.
Austrian company Schletterer Wellness & Spa Design created the spa, which will use the Kirstin Florian and Aromatherapy Associates product ranges.