The Nile can be defined as the longest river by virtue of total head water lenght I.e from where the river is officially called the “Nile". In regard to discharge rate and catchment area the Amazon triumphs the Nile. The Amazon however has a much longer source stream than the Nile.

The Pacific Ocean is almost triangular in shape. It's not perfectly round, but it appears circular when viewed on maps and globes. The Pacific Ocean's apex is in the north at the Bering Strait. 

The world's longest river, the Nile, flows through the continent of Africa. It is approximately 6,650 kilometers (4,130 miles) long and is a significant geographical feature in northeastern Africa. Therefore, the correct answer is (B) Africa.

Copenhagen is the capital and largest city of Denmark, located on the eastern coast of the island of Zealand. It is a cultural, economic, and governmental hub of Denmark. The city is known for its historical architecture, vibrant cultural scene, and being a center for innovation and sustainability. Copenhagen is also a major port city and a popular destination for tourists.

The smallest continent is Australia. Therefore, the correct answer is (A) Australia. Australia is both a country and a continent, and it is often referred to as the "smallest continent" due to its relatively small landmass compared to other continents.

The longest river in the world is the Nile. Therefore, the correct answer is (D) Neil (Nile). The Nile River is a major north-flowing river in northeastern Africa and is generally considered the longest river globally, with a length of approximately 6,650 kilometers (4,130 miles).

The Strait of Gibraltar connects the Atlantic Ocean with the Mediterranean Sea and separates Spain on the European continent from Morocco on the African continent.

The three largest sovereign countries by surface area are Russia, Canada, and the United States. Together they occupy roughly a quarter of Earth's landmass. Other heavyweights in size are China, Brazil, Australia, India, Argentina and Kazakhstan.