two-factor identification sign in location

What if I don’t recognize the location shown in my sign in notification?

When you sign in on a device, you’ll get a notification on your other trusted devices that includes a map showing the approximate location of the new device. This is an approximate location based on the IP address the device is currently using, rather than the exact location of the device. The location shown might reflect the network you're connected to, and not your physical location. Two-factor authentication for Apple ID - Apple Support

If this is an e-mail you received, or a popup on the screen,  about the time you were actually logging in, there is probably nothing to worry about. The location is where your ISP reported it. If their servers are in a location distant from you, there will be a large error. Based on other posts I have read, the distant error can be very large.