The Atlantis Casino Resort Spa is a hotel and casino located in Reno, Nevada. It is owned and operated by Monarch Casino & Resort, Inc. Its three hotel towers have a combined 824 guest rooms and suites. The casino floor spans 64,814 sq ft. Often known simply as "Atlantis," it is one of Reno's most profitable and luxurious properties, competing directly with Peppermill Hotel Casino and Grand Sierra Resort for customers. Nearly $150 million has been spent on upgrading the facility.