Cropped map (team-annotated)
Sonic Heroes 2 locations
Team name Member 1: Member 2: Member 3: Member 4:
Team Sonic Sonic Shadow Silver Scourge
Team Rose Amy Blaze Cream Vanilla
Team Underground Tails Cosmo Manic Sonia
Team Knuckles Knuckles Shade Mighty Ray
Team Archaic Mina Max Mach Sharps
Team Big Big Honey Marine Tikal
Team Chaotix Espio Charmy Vector Saffron
Team Covert Ashura Wechnia Nazo Covert
Team Dark Rouge Fang Bark Bean
Team Babylon Jet Wave Storm Hurricane
Team Badnik Scratch Grounder Coconuts Metal Sonic
Team Eggman Eggman Eggman Nega Chaos Emerl Metal Sonic II
Miscellaneous Tiara Froggy Fiona Fox Egg Pawn
Nic Tempest Megatox Guidashir
HydroCity did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):

HydroCity is a location in the Sonic series. It is a complex hydroelectric dam that has appeared in Sonic the Hedgehog 3 (using the minor deviation Hydrocity Zone.

Sonic Heroes 2

HydroCity makes an appearance in Sonic Heroes 2. Here, it has morphed, owing to almost entire disuse (a vitriolic Knuckles passes through the top of it when departing and visiting Angel Island), into a seething pile of ferrous oxide, metallic madness and contaminated water.