New Gmail feature detects suspicious account activity
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A new feature on Google's Gmail notifies users, if the account is accessed from an unusual location, by posting a warning message saying, "Warning: We believe your account was last accessed from…" along with the geographic region where the suspicious access have been made from.
How it works:
IP addresses, logged according to Gmail's privacy policy, are matched by an automated system with geographic locations.
If an account was accessed from one country and a few hours later it was logged into from another, that may raise an alert, because it might mean that the account is has been hijackecked.
Click on "Show details" next to the message, you'll see the last account activity window with the most recent access points. 
If you believe your account has been accessed by an authorised user, you can change your password in the same window. Or, if you are aware who/why used your account (you or family members traveled abroad) , you can click "Dismiss" to remove the message.
[Source: Gmail Blog]