DESERT: Very dry region that can be developed to be marginally
productive. There are some resources present that can be mined,
food can be produced if the desert is irrigated, and roads
generate some trade.

GRASSLAND: These open lands have especially thick topsoils
making them excellent food producing areas. Food production can
be increased by irrigation. Roughly half of the Grasslands also
have some resources, making them excellent city sites.
Grasslands may be converted into Forests for increased resource
production.

HILLS: An area of rolling hills that offers very easy access to
minerals, sources of water, pastures, and some possibility for
agriculture. When mined, Hills produce excellent resources. They
also produce some food and can be irrigated if necessary.
Irrigating Hills allows the irrigation to pass on to further
squares that may be otherwise cut off from water.

JUNGLE: These areas of rain forest and dense jungle produce
relatively poor amounts of food and no resources. However, they
can be made much more valuable by conversion into either
Grasslands or Forest. For this reason, the long-term potential
of a city site containing several Jungles is good.

MOUNTAINS: This very rugged terrain can only produce a small
amount of resources but this can be increased by mining.
Mountains make the best defense terrain, but the production is
so low that they make a poor economic choice for the site of a
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