The Oasis is a peaceful, relaxed and romantic space. It's a home away from home. You'll enjoy the warmth and hospitality. The property is located in the Collayomi Valley on the north slope of Mt. St. Helena, which looms over the northern end of the Napa Valley on its south side. This country is among the most pristine in this area, with much of the original forests remaining and the creeks running clear and clean.