These are the most interesting 25 facts about San Sebastian:

1. San Sebastian, also known as Donostia, is a coastal city located in the Basque Country region of Spain.

2. It is situated on the Bay of Biscay, on the northeastern coast of the Iberian Peninsula.

3. San Sebastian is known for its beautiful beaches, particularly La Concha Beach, which is considered one of the most beautiful urban beaches in Europe.

4. The city has a population of approximately 186,000 people.

5. San Sebastian is famous for its culinary scene and is home to several Michelin-starred restaurants, making it a popular destination for food enthusiasts.

6. The city hosts the San Sebastian International Film Festival, one of the most prestigious film festivals in the world.

7. San Sebastian has a rich cultural heritage and is known for its architecture, including the grandeur of the Belle Époque buildings.

8. The iconic Victoria Eugenia Theatre is located in San Sebastian and hosts various performing arts events.

9. The Old Town (Parte Vieja) of San Sebastian is renowned for its lively atmosphere, narrow streets, and numerous pintxo bars.

10. San Sebastian is surrounded by beautiful green hills and mountains, providing stunning views and hiking opportunities.

11. The city experiences a mild oceanic climate, with warm summers and mild winters.

12. San Sebastian is home to several world-class universities, attracting students from around the globe.

13. The Kursaal Congress Center and Auditorium is a notable architectural landmark in the city, hosting various conferences, concerts, and events.

14. San Sebastian was designated as the European Capital of Culture in 2016, highlighting its cultural importance.

15. The city is known for its Basque traditions and festivals, such as the Tamborrada drum festival and the Semana Grande (Great Week) celebrations.

16. San Sebastian has a strong surfing culture, with Zurriola Beach being a popular spot for surfers.

17. The Comb of the Winds (Peine del Viento) is a famous sculpture located on the coastline, created by renowned Basque artist Eduardo Chillida.

18. The Monte Urgull and Monte Igueldo are two prominent hills in San Sebastian that offer panoramic views of the city and the sea.

19. San Sebastian has a strong passion for sports, particularly football (soccer) and pelota, a traditional Basque sport.

20. The Basque language, known as Euskara, is spoken by a significant portion of the population alongside Spanish.

21. San Sebastian has a rich history, with evidence of human habitation dating back to prehistoric times.

22. The city has been influenced by various cultures and civilizations throughout its history, including the Romans, Visigoths, and Moors.

23. San Sebastian suffered significant damage during the Spanish Civil War but was later rebuilt and emerged as a thriving tourist destination.

24. The International University of the Basque Country (UPV/EHU) has one of its campuses in San Sebastian, contributing to the city's vibrant academic community.

25. San Sebastian is well-connected by rail and road, making it easily accessible for visitors from other parts of Spain and Europe.

These facts provide a glimpse into the rich culture, natural beauty, and vibrant atmosphere of San Sebastian.