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Marine Ocean Zone is a conjectural term used by Marine the Raccoon to describe the three adjacent water based zones Aqua Lake Zone, Troll Bridge Zone and Aqua Planet Zone on which she operates in Sonic Heroes 2. The names of these zones originate from Sonic the Hedgehog 2, Sonic the Hedgehog and Sonic Chaos.
Aqua Lake Zone
Aqua Lake, born a natural beauty spot, has its side of the bridge decorated with bogus waterfalls, fountains and a plethora of aquatic tributery. North Aqua Lake is used as part of Resort Island, a Babylon racecourse.
Troll Bridge Zone
Troll Bridge does exactly what it says on the tin and provides habitat to the troll - in this case, Guidashir Jahandambelis. This is the most commonly fought boss in the game.
Aqua Planet Zone
Aqua Planet is the other side of Marine Ocean left to rack and ruin by man. Instead, this half plays host to diffused ruins from Mecha Green Hill Zone and Electric Egg Zone and most, if not all, of the water is contaminated, making it an ideal habitat only for Team Badnik (who actually prefer Electric Egg Zone).