posted by rfvv .
1. It is 10km away from this island to that island.
2. It is 10km from this island to that island.
Are both okay? Do we have to use 'away' or not? Is 'It' refers to 'the distance'?
Second one makes sense, first does not. I think it is better to use "the distance" instead of "it" as "it" is indefinite.
I disagree with Brea to an extent. "It" does refer to the distance and is perfectly acceptable. She's right that #2 is better than #1. Using "away" is redundant, although not incorrect. It's just an extra word.
I disagree with Reed, to an extent.
"This island is 10 km away from that island"
is common usage, while #1 seems to say that "it" is 10 km away. Not so. I'd say that you'll never hear a native English speaker use #1's syntax.