This is the story of the fallen angels. The beginning, 6.1-2, is virtually identical with Genesis 6.1-2. In Enoch’s book, we get their names and many other details. At 6.6, Enoch explains the naming of Mount Hermon – in Hebrew it means curses. The mountain that he was actually referring to is possibly somewhere near Lake Van in Turkey. It is common for translators to update names rather than use phonetics, so the few names that appear, mainly mountains and rivers, can’t be relied upon as accurate identifications. We don’t know whether th ere was another mountain called ‘curses’ or even what language the book was originally written in.
At 7.2, he says they had giant sons. I believe that this means, not that they were physically big, but powerful and wealthy with private armies. Nevertheless, the Watchers may have been larger than the local people were. Many years of advanced healthcare and nutrition can lead to increasing ave rage size.