There are several synonyms that can be used for the term "abandoned country" which can help to add variety and depth to your writing. These include "deserted lands", "forgotten territories", "uninhabited regions", "vacant nations", "lonely landscapes", or "wasteland nations". Each of these synonyms carries a slightly different connotation, but all convey the sense of a place that has been deserted or left behind. They may be used to describe actual countries or regions, or they may be used more figuratively to describe a sense of isolation or loneliness. By using these synonyms creatively in your writing, you can evoke a wide range of emotions and imagery for your readers.