The empty terrain has hardly any impact on performance, and although it doesn't look great, it would take more time to remove and add back later than is worth the while. Geographic? The map's content and design are referenced from the suburbs of Chicago, so I'd say somewhere around the Central-Western Great Lakes area. Northern Ohio, Michigan, Northern Illinois, Wisconsin, or Southern Ontario would be the likeliest places. Yeah, I was going for the old Mercury vapor streetlights, which stand out to me as being the definitive night lighting option. Honestly, I get kinda sleepy looking at them. Reminds me of long overnight car rides from my childhood, but I can see the element of foreboding and suppose it works for a map set in the weeks approaching Halloween.