city.

OCEAN: Oceans produce small amounts of food, but a substantial
trade. Only ships or aircraft can enter Oceans. Landlocked
Oceans are really lakes but are treated like other Oceans in all
respects.

PLAINS: These open areas differ from Grasslands in having poorer
soil but better resources of timber and minerals. They are poor
food producers unless irrigated. Due to the presence of
resources, they make good choices for city sites. Plains may be
converted into Forests.

RIVERS: Rivers are great sites for starting cities and
civilizations due to the richness of riverbank soils and natural
trade routes for boats. Rivers are as good as Grasslands for
producing food and always generate trade. River terrain may be
irrigated to increase food production. It was no accident that
the first civilizations sprang up along rivers.

SWAMP: The coastal wetlands and flooded interior lands produce
only a small quantity of food. Like Jungles, however, they can
be converted into Grasslands and Forest.

TUNDRA: These sparse lands of permafrost produce only a small
amount of food from grazing animals. There is no agriculture or
use for irrigation. These areas cannot be converted to other
terrain and make very poor city sites.

FOREST: These woodlands produce a modest mixture of food and
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