Textures too small?

So I’m trying to make an island, and I dropped the Terrain feature because it didn’t let me build caves which are an integral part of my map. And I have a nice texture that works well with the map, It’s moulded to fit perfectly, except at 4096 the texture lacks the detail I need, as you can see in the screenshot. Is there a way to import larger textures, or should I make the landscape out of several different textures? Halp!

You should use a tiled texture, so it repeats. That way it can be high-resolution yet cover a large area. From the looks of the screenshot, a tri-planar shader would be appropriate.