When the Oasis is motivated, its production is not doubled, but one refined good of each type from the building's age is produced in addition to the coins already produced. The production is however boosted by enthusiastic population and by boosts of certain great buildings. The building can be plundered if it isn't motivated.
This building requires a road connection.
The Oasis is also similar to the Tribal Square, a building available as a prize on Guild Expeditions. The aspect is different but the size is the same. Unlike the Oasis, the Tribal Square’s coin production is doubled when the building is motivated, as well as producing goods.