Help in getting smooth gameplay(world creation) and even to display my landscape verey beautiful

I am creating a map of 30 sq km. I need to focus on smooth gameplay. Can any one give me some tips to make it. For better game play I am thinking to add more vegitation with different biomes and rivers with some waterfalls and lakes.but I am focusing on smooth and better game play. Even I need to render the frame just like our eyes which are abled to see far objects. So please give me some help

Hello there @leo79279!

Since you are getting started on your project, I would suggest checking the following guides from the community, to ensure you are taking the rights steps for your map: