A volcanic lake is a body of water that forms in a volcanic crater or caldera. These lakes can be created when rainwater, melted snow, or groundwater fills the depression left by a volcanic eruption. The water in these lakes can be warm or even hot due to geothermal activity, and they may contain minerals and gases released from the surrounding volcanic rock. Some famous examples of volcanic lakes include Crater Lake in Oregon and Lake Toba in Indonesia. These lakes can be stunningly beautiful, often featuring deep blue waters and steep, rugged shores. They also provide unique ecosystems that support various plant and animal life.