The 158-bedroom Meritage Resort and Spa in Napa Valley, California, US, is to expand its capacity by a further 165 bedrooms in early 2012.

The resort, which boasts an 9,000sq ft (836sq m) underground spa, has also joined Associated Luxury Hotels International as part of its expansion strategy.

Situated beneath the grape-crusher statue at the Meritage, the resort's Spa Terra features 10 private, temperature-controlled treatment rooms, separate male and female steam saunas and soaking pools with water walls.