Log into your google account directly via security.google.com in a fresh browser window, and you should be able to tell whether there has really been any unusual activity on your account.
The only thing I have figured out is that the notice was of someone in Georgia who tried to do the login, and for some reason my default location before I log into Google News is the same place in Georgia.
You can also look at the URL for the Explore my Devices link, usually by hovering over it or right-clicking and choosing Properties. If it’s not a Google domain, then it’s hinky. Beware of addresses that seem like they have “google” but it isn’t part of the root, like google . letmescamyou . com.
I’m using chrome. When I hover my pointer over a link, in the bottom right of the window, the url the link goes to will appear. In this instance, I’d expect a legitimate message from google would go to a google domain.
There are live Phishing attempts that use this ruse. It is reasonably clever in that you may get legitimate warnings - especially when you log in from a new device for the first time. Thus you get used to them being legit. I have received clearly fraudulent such emails - citing an account I do not actually have, but plausibly might, being logged into at a suspicious location.
Do you have two factor authentication set up on your Google account? If so you should have received a text with a verification code when the log in was attempted. If not, you might want to consider setting it up.
Did you use a different browser or different computer to log in to your account? I get these every so often when I do log in from a different computer or browser. I usually get it quite quickly too, like minutes after I log in. If that’s the case then I ignore it since I know I’ve just logged in.
I guess it’s possible that someone tried to log in as you, either by accident, or on purpose, and Google is letting you know.
When you log on to Google from a new device (like a different computer or a tablet you’ve never used before), Google sends out that notice automatically.
If you recently logged in from a new device, ignore the message.
If you haven’t there’s a chance someone has hacked your password. Change your password immediately. You may want to take further steps to alert Google what has happened.