From Halopedia, the Halo wiki
Breakneck is a multiplayer map included in Halo: Combat Evolved Anniversary and the Anniversary Map Pack for Halo: Reach. It is a remake of Headlong from Halo 2. It is the only Halo: Reach multiplayer map to be set on Earth.
Universe and lore
Breakneck is set in the city of New Mombasa, in a part of the docks known as Section 21, which closely resembles the Section 14 featured in Headlong. The area is lined by buildings on all but one side, which opens up to the sea with a view of a structure resembling the Uplift Nature Reserve and the city center. The playable area is dominated by a New Branch construction site, a hotel and an elevated road under construction.
The following are locations on the map that are so named on the player's heads-up display during gameplay: