Looking for a little direction on building a scrolling map

I have always wanted to make a war game similar to the old Empire Deluxe (Empire Deluxe Enhanced Edition) and Battles of Destiny (-40% Battles of Destiny on GOG.com) I really liked the simplicity/easy play of these older domination games. I have the unit movement and combat worked out, but have always been stumped on how to create a continuous wrap around map. It seems to be so simple, yet it has always eluded my. If anyone has any suggestions I would be grateful if you could lead me in the right direction.

Have a look at noise textures. Heres a Tutorial on how to use noise textures with Tile-Maps: https://www.youtube.com/watch?v=UfeKcogpS6w