Wave Ocean

Description
Wave Ocean is the first action stage in Sonic the Hedgehog which is a beach. A whale is seen while playing as Sonic. Wave Ocean is located in Soleanna, a country in Sonic the Hedgehog. It seems to be based off Emerald Coast from Sonic Adventure.

Sonic
Wave Ocean is Sonic's first level in the game Sonic the Hedgehog. It is overrun by Eggman's "mechs." Eventually Sonic runs into a whale and runs from it, but eventually he ends up grabbing onto its fin. Then Tails goes to close the door so it doesn't get out. Then Sonic goes through a super-speed area to catch up to the Egg Carrier to try and save Elise, which he failed at. Later in Sonic's story you play Wave Ocean a second time, as Tails.

Shadow
In Shadow's story in Sonic the Hedgehog, he goes to Wave Ocean looking for Omega and Mephiles. In Shadow's story, Wave Ocean is inhabited by Iblis and Mephiles-type monsters.

Silver
Silver doesn't play through Wave Ocean, but Blaze does. She goes through it looking for Silver. It is Silver's extra stage in Sonic the Hedgehog.

Trivia

 * In Sonic's version, the portion where he runs away from a whale, it is a possible reference to Emerald Coast in Sonic Adventure.