Mundus Magnus v2
Template:Mod Information Table (no map) Mundus Magnus is a mod for Rome: Total War v1.2 and is currently in version 2.0
Summary
Mundus Magnus is a highly reputed map modification for Rome: Total War, by modder ngr. The mod provides a much larger and more detailed campaign map to the Vanilla R:TW, and adds various other tweaks and fixes.
Release Date: June 20th, 2005
Note: The mod creator doesn't frequent the TWC any more, so support for the mod is unavailable.
Team and Credit
Mod Author: ngr
Download Links
Download: Here
Alternatively, a lot of people seem to have trouble with MM v2, so you could try MM v1 which seemed to work fine.
Release Thread: Here
There doesn't seem to be an existing release thread for MM v1.
Additionally, there seems to be a lot of additional tweaks to the MM map, or updates to newer versions, just search "Mundus Magnus" in the TWC Downloads area under RTW Mods and have a look around.