A tarn is a small mountain lake or pond, typically formed by glacial activity. These bodies of water are often found in high-altitude areas, nestled in rocky depressions or cirques. Tarns can vary in size and depth, and they are usually fed by melting snow or rainfall. Tarns are important ecosystems that support various forms of wildlife, including fish, amphibians, and aquatic plants. They also play a role in the local hydrology, contributing to the water cycle in mountainous regions. Popular among hikers and nature enthusiasts, tarns often provide stunning views and serene environments for outdoor activities.