IN 1993, THE UNITED STATES, Canada, and Mexico signed the North American Free Trade Agreement (NAFTA), which created a regional free trade zone that lowered tariffs and trading restrictions and encouraged greater opportunities for cross-border investments and movement of goods and services between the three countries.

Norfolk Island, an Australian territory, is located in the south Pacific Ocean, 1,041 mi (1,676 km) northeast of Sydney, Australia.

ONE OF THE WORLD’S largest coral islands and smallest countries, Niue is about the size of metropolitan District of Columbia in the United States and has a population the size of a small town.

AT 4,132 mi (6,650 km) long, the Nile River is the longest river in the world. It flows from two principal sources in equatorial Africa that join at Khartoum, Sudan, and continues north through Sudan and Egypt, emptying into the Mediterranean Sea.

NIGERIA, THE MOST populous nation in Africa, is bordered to the south by the Gulf of Guinea in the Atlantic Ocean, and to the west and east by the Republic of Benin and Cameroon, respectively.

LOCATED IN West Africa, the Niger River stretches 2,610 mi (4,200 km) in length, making it the thirdlongest river in Africa, after the Nile and the Congo.

A LANDLOCKED republic in West Africa, Niger is bordered by Algeria to the northwest, Mali and Burkina Faso to the west, Benin to the southwest, Nigeria to the south, Chad to the east, and Libya to the northeast.

BORDERED by Costa Rica and Honduras, Nicaragua is the largest country in Central America.

LOCATED IN NORTHERN Tanzania, 80 mi (129 km) west of the city of Arusha is the Ngorongoro Crater.

IN THE SOUTH Pacific Ocean, the country of New Zealand lies to the southeast of Australia.