|Game||Ecco the Dolphin|
|Objectives||Find the exit.|
|Level #||15 (Genesis), 21 (CD)|
|Previous Level||The Library|
|Next Level||City of Forever|
|Typical Creatures||Marble Sea Jellyfish, Schooling Puffer Fish|
Deep City is the fifteenth level of Ecco the Dolphin in Genesis, or the twenty-first level in Sega CD. It is the third Atlantis level.