Large fish aquarium and base. Don`t know the exact size. I think it`s around 50 to 55 gallons. Comes with everything you need except fish and water. Includes filter, heater, bubbler, rocks, decor, food, chemicals, nets, and siphon hose with sink attachment for easy cleaning and re-filling. Also, will throw in a 10 gallon aquarium to put fish in while cleaning.