Downtown Aquarium (formerly Colorado's Ocean Journey) is a public aquarium and restaurant located in Denver, Colorado at the intersection of I-25 and 23rd Ave. The 107,000 square feet (9,900 m) main building sits on a 17-acre (6.9 ha) site adjacent to the South Platte River. Its freshwater and marine aquaria total approximately 1,000,000 US gallons (3,785,000 l), and exhibit a variety of fish and other animals.
The Downtown Aquarium in Denver is owned and operated by Landry's Restaurants, Inc., and is the largest aquarium between Chicago and California. It is accredited by the Association of Zoos and Aquariums (AZA).