This is the 35th most frequent Icelandic word.
hér
"Here."
The word "hér" signifies the physical location where the speaker is situated.
Ég er hér og bíð eftir þér.
I am here waiting for you.
The word "hér" refers to a temporal aspect, introducing a time frame from the past.
Hér áður fyrr var þetta allt landbúnaður.
In the past, this was all agriculture.
The word "hér" points to the specific context or vicinity where the action (seeing the waterfall) is taking place.