Frauenfeld is a city in the canton of Thurgau in Switzerland. It is the capital of the canton and is located in the northeastern part of the country. Frauenfeld is known for its charming old town, which has well-preserved medieval buildings and narrow streets. The city is also home to Frauenfeld Castle, a prominent landmark that dates back to the 13th century. In addition to its historical attractions, Frauenfeld offers a range of cultural events and festivals throughout the year, including the Thurgau cantonal fair, which attracts visitors from all over Switzerland. The city has a population of approximately 24,000 and is an important economic and administrative center in the region.