Zones

Areas are regions of the map created by the world generator. An area defines what weather is common or even possible, what buildings will be generated, the zombie population density, and more. When a player enters a new world, the world is randomly generated using seeds. The game is set in a non-specific place in the United States, and as such most areas are drawn from American geography and culture. However, Sandswept developers do not see this is a restriction, so there may eventually be distinctly non-American areas.

According to Geoff Keene, the first alpha release will most likely have "[a] type or two of Suburban, a type of forest, and a type of park."[1]

Confirmed areas

Suburbs

Suburbs are areas around cities which are less densely populated and have more open space. Suburbs contain widely spaced housing with yards around them, school districts, convenience stores, and small parks.

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Rural areas

Rural areas are not very densely populated. They make up a lot of the inhabited area on the outskirts of towns. A rural area features farmland, cornfields, wheat fields, barns, farmhouses, and small roads. There is a very large amount of open space.

Forests

Forests are areas with a lot of trees. Forests are often on a slope, and consist of dense woods sprinkled with clearings. While few human zombies can be found here, there is a larger amount of zombie animals. Types of forest include national parks, deciduous forests, and pine forests.

Source: http://www.sandswept.net/forums/viewtopic.php?p=2140#p2140