How do I quickly save a large number of variables?

Have you tried using an array?

What are the different ways you have tried saving them? For that amount I'd suggest using a database engine of some sort.

Most people tried some sort of image map and that seems to work fine. Have you tried saving the data as a simple image object? Do a search for terrain image map here in the forums. That might help.

Okay, I tried making my 2d array into a 1D array, and it seems to work, but where does it save my file? Here is the code, thanks!

 import System.IO;
 var TerrainD:Terrain;
 function Start () {
 
 var TD = TerrainD.terrainData;
 var heights:float[,] = TD.GetHeights(0,0,512,512);
 var BigArray = new byte[263169];
 print(BigArray.length);
 var Inte = 0;
 for (var y : int = 0; y < 512; ++y) {
     for (var x : int = 0; x < 512; ++x) {
         BigArray[Inte] = Mathf.Round(Mathf.Lerp(0,65535,heights[y,x]));
         Inte+=1;
     }
 }
 print(Time.time);
 // Apply all SetPixel calls
 File.WriteAllBytes( "/Hello.ini", BigArray);
 }

To be more exact, where is it saving Hello.ini? Also, the code doesn't seem to be working because it doesn't seem to be creating a file.