GeoBuff Daily Geography Trivia — Thursday, June 18, 2026

GeoBuff Daily Geography Trivia, the Thursday, June 18 edition — 10 geography questions with answers and explanations.

Each set is AI-assisted and reviewed by GeoBuff before it is published, and a new set is released every day.

The Columbia River, shown here flowing through the Pacific Northwest, forms much of the border between Oregon and which U.S. state? The answer is Washington. The Columbia River forms a natural border between Washington and Oregon for much of its lower course. It is the largest river in the Pacific Northwest by volume.

Which U.S. state shares its name with the longest river in North America? The answer is Missouri. The Missouri River, stretching approximately 2,341 miles, is the longest river in North America. The state of Missouri is named after this iconic waterway.

Which South American country has won the FIFA World Cup three times, including victories in 1978, 1986, and 2022? The answer is Argentina. Argentina is one of the most successful football nations in history, winning the FIFA World Cup in 1978, 1986, and most recently in 2022 in Qatar.

The Great Wall, shown here stretching across mountainous terrain, is one of the most famous structures in which country? The answer is China. The Great Wall of China stretches over 13,000 miles across northern China. Construction began in the 7th century BCE, with the most well-known sections built during the Ming Dynasty.

Which North American country is home to Wall Street and the headquarters of the world's largest technology companies by market capitalization? The answer is United States. The United States is home to Wall Street in New York City and the headquarters of major tech giants like Apple, Microsoft, and Alphabet.

Which Asian capital city is home to the Azadi Tower and the Golestan Palace, a UNESCO World Heritage Site? The answer is Tehran. Tehran, the capital of Iran, features the iconic Azadi Tower built in 1971 and the historic Golestan Palace, which was designated a UNESCO World Heritage Site in 2013.

Which African country is one of the world's top exporters of natural gas and is a member of OPEC, with its economy heavily reliant on hydrocarbons? The answer is Algeria. Algeria's economy is dominated by oil and natural gas exports, which account for the vast majority of its export revenue. It has been a member of OPEC since 1969.

The Sydney Opera House, shown in this image with its distinctive sail-shaped roof, is an iconic landmark of which country? The answer is Australia. The Sydney Opera House is located in Sydney, Australia. Designed by Danish architect Jørn Utzon and completed in 1973, it is a UNESCO World Heritage Site.

Which Asian country on the Mediterranean coast is home to the ancient Roman temple ruins at Baalbek? The answer is Lebanon. The Baalbek temple complex in eastern Lebanon contains some of the best-preserved Roman ruins in the world, including the Temple of Bacchus.

The Golden Gate Bridge and Yosemite National Park are both found in which U.S. state? The answer is California. California is home to numerous iconic landmarks, including the Golden Gate Bridge in San Francisco and Yosemite National Park in the Sierra Nevada mountains.