well its the biggest Region in the country
No, it is a country.
The US - seeing as it is the only country in the US....
Landlocked means a particular country or region has no border with a sea or ocean. Switzerland is a landlocked country. The Great Basin of the US is a landlocked region.
Canada
Flanders is not a country. It's a region of the federal state of Belgium. The region contains 13.521 km² and has approximately 6.000.000 inhabitants.
In a big country
Tibet is an autonomous region of China, not a country. In terms of land area, Tibet is considered to be the second-largest region in China after Xinjiang.
mexico
oregon country
Mexico.
If the UK is selected, then it's a PAL region DSi. DSi systems are region locked for certain content, you can only change the country and not the region. The US isn't an available country on a PAL region DSi, it's available on the American DSi.