Biržai is a city in northern Lithuania. Biržai is famous for its reconstructed Biržai Castle manor, and the whole region is renowned for its many traditional-recipe beer breweries.\
The northern part of the city, along with Lake Širvėna, lies within Biržai Regional Park. About 9,000 sinkholes have been identified in the park, formed abruptly after gypsum in the soil has been dissolved by underground water. Some of these holes are dry, while others have become small ponds or lakes filled with water from the many underground rivers and streams. New holes appear annually. According to local legend, the 20-meter-deep sinkhole known as Karves uola (Cow's Hole) was discovered by a farmer after his cow disappeared. A tunnel at its bottom leads to an underground cave and lake. |
