I believe the furthest behind in time are the Galapagos Islands off the coast of Chile.
Russia is the country that is second furthest from the equator, with its northernmost point located at a latitude of around 81 degrees north.
The geographical centre of a country.
Newfoundland and Labrador is the furthest east province in Canada. It is located on the easternmost edge of the country, surrounded by the Atlantic Ocean.
Your question doesn't quite make sense (behind what?), but the part of Texas that is in the Mountain time zone includes the Counties of El Paso and Hudspeth and, in Culberson County, Pine Springs and Nickel Creek. (Only about 2% of Texas is in the Mountain time zone.)
The country that is 12 hours behind GMT is American Samoa.
The country located furthest behind the time zone is American Samoa.
The country that is the furthest behind in time compared to the rest of the world is American Samoa.
American Samoa is the country that is the furthest behind in time compared to Coordinated Universal Time (UTC).
The country that is the furthest behind in time compared to Greenwich Mean Time (GMT) is American Samoa, which is 11 hours behind GMT.
The time zone furthest behind Greenwich Mean Time (GMT) is the Baker Island Time Zone, which is 12 hours behind GMT.
The time zone that is the furthest behind in relation to Coordinated Universal Time (UTC) is the Baker Island Time Zone, which is UTC-12.
The country that is furthest ahead in time compared to the rest of the world is New Zealand.
The country that is the furthest ahead in time compared to the rest of the world is New Zealand.
Kiribati's Line Islands Time and Samoa Summer Time are furthest ahead, at UTC+14.
If you count Iceland as a part of Europe, it is furthest west. Otherwise, the furthest west European country is Ireland. The furthest west country in mainland Europe is Portugal.
Singapore
Brazil