Spain is the only country to border Portugal to the east.
East in Mississippi River and West in Rocky Mountains
mostly the ozark mountains and there is many caves in Arkansas because native Americans used them for shelter in snow& rain. there are also lakes like baltz greers ferry norfolk. and rivers current foushe black seven point spring.
The only state with part of its boundary defined by the arc of a perfect circle is Wyoming. The eastern boundary of Wyoming follows the 42nd parallel north latitude line, which forms part of a perfect circle around the Earth.
The Cell Membrane forms the outside boundary that separates the cell from its environment.
Mississippi
Spain forms the eastern boundary of Portugal.
The Indian Ocean forms the eastern boundary of Africa.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
Spain is the only country to border Portugal to the east.
the country that forms the northern boundary of the United States is Canada :)
The Atlanic Ocean
Minnesota.
The states of Iowa, Missouri, and Arkansas have their eastern borders on the Mississippi River. The Mississippi River borders seven other states.
The Connecticut River
The Mississippi River is the East boundary for Arkansas.
The country is Eritrea, and it's eastern boundary is formed by the Red Sea.