The Arabic text-to-speech currently makes numerous mistakes in pronouncing them. I'd recommend straying away from depending on it—only use them to remind you of the words' roots (or hear a very rough idea of what it should sound like).
Unfortunately, there is no mountain close by my city, was not accepted. Close to and close by are the same, are they not? Also, near by was not accepted. Close by my city, is the same as near by my city.