How to unlock civilization 6 reserve?

Choose a suitable city location, build the city and choose the corresponding policy card, and use the engineering unit to arrange the terrain.

1. Choose a suitable city location: Choose a location where you want to establish a protected area, and ensure that the location meets your strategic needs and goals.

2. Choose the corresponding policy card for building a city: by expanding the national border, build a new city in an appropriate position. Select policy cards related to the territory on the government panel (such as "wild zoo") to improve the natural resources and environmental benefits of the territory.

3. Decorate the terrain with engineering units: Decorate the surrounding land with engineering units (such as settlers) to create an idealized effect.