Horizon[ON] is an all-round solution to make your horizons look great, even on small terrains. Terrains usually have to be much bigger than the accessible area, just to hide the square shape of your world. Horizon[ON] will extend your terrain as far as the eye can see.
With the latest update the visual fidelity has been upped to a level that is on par with, or even surpasses, current AAA productions. Your performance most probably even gets better by using Horizon[ON], since you don't need huge and expensive terrains just to fill your backgrounds.
Works with unity terrains or mesh terrains.
Horizon[ON] is used extensively in the featured "Made with Unity" game D.R.O.N.E.
Asset version: 1.4.1
More Info: _https://assetstore.unity.com/packages/tools/terrain/horizon-on-31861