Central Asia… Apple being a relative of rose, a major wild plant all over from Kazhakistan, Altai Republic, Mongolia, etc… along with cannabis. You see these two plants just everywhere in the southern regions… I’ve also heard of likely Persian origin for many related fruits, such as peaches and apricots
The roman/latin name for peaches was malum persicum (persian apple). The romans got the fruit from the persians, but the persians themselves got it from central asia or china.