The main entrance to Seville Aquarium is located on the riverfront at Muelle de las Delicias, near MarÃa Luisa Park. It's a bit tucked away, so keep in mind that signage leading to it can be sparse. Once you’re near the river, you’ll find the entrance clearly marked along the waterfront. The waiting time to enter is usually minimal, especially on weekdays. However, during peak seasons or weekends, expect to wait around 15 to 30 minutes. The main entrance is easily accessible by public transport, including the Seville Hop-On Hop-Off bus, which stops nearby.