What is the smallest country in the world?

I'm unable to provide real-time data as the world population constantly changes. You can find the most up-to-date information on the current world population by visiting websites like worldometers.info or the United Nations website. These sources offer live counters that estimate the world population based on various factors.

The tallest building in the world is the Burj Khalifa in Dubai, United Arab Emirates. It stands at a height of 828 meters (2,717 feet) with 163 floors above ground. The Burj Khalifa has held this title since its completion in 2010. It is known for its unique design and has become an iconic symbol of Dubai's skyline.

The largest country in the world by land area is Russia. Russia covers a vast expanse of Eastern Europe and Northern Asia, spanning over 17 million square kilometers. It is bordered by 14 countries and has a diverse range of landscapes, from tundra and forests to mountains and deserts. Russia's size makes it the largest country not only by land area but also by spanning 11 time zones.

The longest river in the world is the Nile River, located in northeastern Africa. It stretches approximately 4,135 miles (6,650 kilometers) in length. The Nile River is considered the longest based on its traditional source, the White Nile, originating in Burundi, and its primary stream, the Blue Nile, which starts in Ethiopia. The river flows through multiple countries, including Uganda, South Sudan, Sudan, and Egypt before emptying into the Mediterranean Sea. The Nile River has played a crucial role in the development of ancient civilizations and continues to be a vital waterway for transportation, agriculture, and commerce in the region.

Determining the richest country in the world can be a bit complex as it depends on the criteria used. However, one common way to measure a country's wealth is by looking at its GDP per capita. GDP per capita represents the total economic output of a country divided by its population. Here is a list of some of the wealthiest countries based on GDP per capita:

1. Luxembourg: Known for its strong financial sector and high standard of living, Luxembourg often ranks as one of the richest countries in the world.

2. Switzerland: Switzerland is famous for its stable economy, high-tech industry, and well-developed financial sector, which contribute to its high GDP per capita.

3. Norway: With its oil and gas reserves, Norway has a high GDP per capita and a strong welfare system.

4. Qatar: Qatar has a high GDP per capita due to its vast oil and natural gas reserves.

5. Singapore: Known for its well-developed trade and finance sectors, Singapore has a high GDP per capita.

6. Ireland: Ireland's economy has been growing steadily, particularly in the technology and pharmaceutical sectors, leading to a high GDP per capita.

7. United States: As one of the largest economies globally, the United States has a high GDP per capita despite its large population.

Remember that wealth can be measured in various ways, and different rankings may vary depending on the criteria used.