If you want to make a National park in Civ 6, you will need to make a set of requirements, so here's what they are and how to meet them.

How to build a National Park in Civilization 6 using a Naturalist 

In order to make a National Park, you will need to build in a cluster of four hexes that meet the following requirements in Civilization 6. 

• Your tiles must be natural wonders or mountains, or alternately have an appeal of charming or better. 
• All four of these titles must be own by the same city.
• The tiles will also need to have a vertical diamond shape.
• You will also need to have no districts or improvements in any of these tiles. 

Along with the basic requirements listed above, you will need to have faith and research the conservation Civic. After researching the conversation civic, you will build the national park if you have enough faith points with a Naturalist unit.

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However, it's worth noting that not every spot in the game is going to be suited for a National Park, so to get around this, you can raise the appeal of those tiles by doing various things such as planting woods.

Doing this will give the tile area a plus-four to appeal, but there are also other things you can do. The first is that you can build either great wonders like the Eiffel Tower or have appeal-raising distracts such as holy sites or entertainment buildings in the area. Having great people such as great engineers like Charles Correa will also raise tile appeal. 

For more on Civilization 6, we recommend checking out How to get Amenities in Civ 6.

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