This is a recreation of the Emerald Coast level from Sonic Adventure(most of it anyway) in Halo 5. It's essentially a race map made by Unfound. He did an amazing job with recreating the level and would recommend having a look if you've played Sonic Adventure.
Map Name: Emerald Coast
Game Variant: N/A
Creator: Unfound
Another incredible Forge Creation: https://www.bungie.net/en/Forum/Post/205645758/0/0
[spoiler]Side Note: Would anyone like to see me post weekly forge highlights like this and my previous forge map post in the future? [/spoiler]
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Never played a single sonic game, ever.