What are all the dlc maps for Halo 3?

The downloadable content (DLC) maps for Halo 3 include "Heroic Map Pack," which features "Standoff," "Rat's Nest," and "Foundry," and the "Legendary Map Pack," which includes "Blackout," "Avalanche," and "Ghost Town." These maps expand the multiplayer experience, offering diverse environments for gameplay. Additionally, "Foundry" allows players to create custom maps, enhancing the game's replayability.