Herisau is a small city located in the Appenzell Ausserrhoden canton of Switzerland. It is known for its picturesque old town, which is full of traditional Swiss architecture, and its beautiful surrounding countryside. Herisau is also home to the Swiss National Park, which is a great place to explore the natural beauty of the region. The city is also known for its many festivals, such as the Appenzeller Fest, which celebrates the local culture and traditions.