Belgium and Luxembourg are small countries both north of France.
The State of Kuwait is the smallest country that is bordered by both Saudi Arabia and Iraq. Kuwait shares its southern border with Saudi Arabia and northern border with Iraq.
The Mississippi River forms the eatern border. The St. Frances River form a small part of the border on the northeast. The Red River forms a small part of the southwestern border.
The Mississippi River forms the eatern border. The St. Frances River form a small part of the border on the northeast. The Red River forms a small part of the southwestern border.
The US is primarily located in the northern hemisphere. The equator passes through the southern border of the country, so a small portion is also in the southern hemisphere.
Southwest of Iraq is Saudi Arabia, which while it does border the Persian Gulf is NOT small. Kuwait is on Iraq's southeastern border and is a small country that borders the Persian Gulf.
The eastern border of Chile is for the most part, the country of Argentina. Chile also has a small border to the east with Bolivia.
Jordan Uruguay
All of Columbia is in the Western Hemisphere. However ... Practically all of it is in the Northern Hemisphere but, the Equator crosses it very near its Southern border so a small piece on the southern end of the country is in the Southern Hemisphere.
Qatar and Kuwait are both relatively small countries that border the Persian Gulf
Uruguay
Swaziland
No town in South Australia lies on the border with Victoria. The closest is probably Frances, a small township with a population of about 50, between Bordertown and Naracoorte on the now disused railway line. It is about 1 kilometre west of the border.