Although it is very difficult to distinguish the different options (please use punctuation next time), the characteristic of Romanticism that is not represented strongly in Byron's poem When we two parted is the reference to mysterious or exotic places. He is referring to nature ("The dew of the morning/Sunk chill on my brow"), he is also referring to a time in the future and he is imagining an encounter with her lover ("If I should meet thee/After long years/How should I greet thee?"), and, lastly, he is expressing strong and overwhelming emotions ("They name thee before me/A knell to mine ear/A shudder comes o’er me/Why wert thou so dear?"), but there is no reference to any mysterious or exotic place.
This is a very sad and "gloomy" poem, about two lovers that are no longer together, and about the desolation and pain they feel afterwards (even hearing her name is painful to one of them), although they knew that their secret, and perhaps forbidden, relationship was not meant to last.