Europe:
- France and Germany: French and German
- Germany and Poland: German and Polish
- Italy and Switzerland: Italian and German
- Spain and Portugal: Spanish and Portuguese
Asia:
- China and India: Mandarin Chinese and Hindi
- India and Pakistan: Hindi and Urdu
- Japan and South Korea: Japanese and Korean
- Thailand and Cambodia: Thai and Khmer
Africa:
- Kenya and Tanzania: Swahili and English
- Nigeria and Cameroon: English and French
- South Africa and Namibia: English and Afrikaans
North America:
- Canada and the United States: English and French (in Canada)
- Mexico and the United States: Spanish and English
South America:
- Argentina and Brazil: Spanish and Portuguese
- Bolivia and Peru: Spanish and Quechua
- Colombia and Venezuela: Spanish
It's important to note that these are just a few examples, and there are many other countries and languages spoken in neighboring regions around the world. Additionally, some countries may have multiple official languages or significant linguistic diversity within their borders.