where it is meaning

• (informal)
    The real situation, point or explanation

• a'where:     adverb   ...
• where:    Adverb: where  ...
• where it's at:     see under where; ...

Examples

1. she enters the wood, where it is already twilight.
2. judging by the crowds waiting to get in, this seems to be where it is.
3. it felt comfortable to be in a country where it is so simple to make people happy.
4. the deepest relief along the bar is on the shoreward side where it is backed up by a lagoonal channel.
5. the vapor passes through the control line and into the canister, where it is absorbed by the charcoal.