In the HOME XI Beleriand map Angband (or at least Thangorodrim) is shown. However, it is not present on the map in the published Silmarillion. The reason was that CT noticed that according to the text it should be further north than the map suggested.
As for Utumno it was located much further to the North East. Remember that the Iron Mountains where raised in a great semi-circle to protect it, so it was probably located in the center of that semi-circle. Angband was in the western part of the Iron Mountains.
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