Cities randomly disappearing

[Subzer0 0]

 Earlier today I was playing simcity, and everything was going smoothly, until the game suddenly crashed for no reason I could think of (and normally I can at least attribute one thing to why it crashed). When I restarted the game, two cities were completely erased, and replaced with the standard completely blank slate. Nothing is left. The city I was playing in when it crashed was NOT erased: its completely fine. I'm not sure if it has anything to do with it, but the cities erased were cities I had just played earlier. They were also the largest ones. In addition to this, they border each other, as well as the city I was playing in when it crashed, however I was not modifying the border in any way. The most unusual thing is that when I go to the simcity folder in my documents, then regions, the city .dat files are still there, and do not appear to be corrupted. Does anyone know what could've caused this? Any help is greatly appreciated! They were my best cities and I was considering making a CJ from them! Help!!!

[Yuu Caa Sim 55]

It's possible that the regional pictures somehow got deleted. You can try and load the blank cities in the game to see if the cities are still there. If they are not, then you should move the city files (.sc4) affected from its region folder into the "Downloads" region folder within SimCity 4\Regions. Within the game, select the blank city tile, and instead of clicking the "play" button, click on the "import" button (I think it looks like a computer with an arrow). Navigate to the "Downloads" folder, find your city and select it. The city should now be back where it should be.

[Subzer0 0]

Thanks for your help, but sadly this did not work =[ . When I play the city, its blank. When I select import, It would not open the downloads folder. When I moved the files to another directory, those files wouldn't simply didn't show up. This just keeps getting weirder and weirder.