Valhalla or Sandtrap.
Default Sandbox was quite cool as well. Just not as good as those two. Same goes for Standoff.
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Ooo.. I forgot about Sandbox. An infinite amount of custom maps can be make with that. I guess if you don't count the forge capabilities, Sandtrap wins.
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I don't count Forge maps except for default layouts. Because it's just not fair otherwise. Also discounts Bastion, Nebula and Echo from H4 discussions. And Forgescape from Reach. Sorry, that's Ravine, Impact, Erosion and Forge World.