A hot spring is a natural spring of water that is heated by geothermal energy from the Earth's interior. These springs often contain minerals that can be beneficial for health and relaxation. The temperature of hot springs can vary, but they are typically warmer than the surrounding air and can reach temperatures of over 100°F (38°C). Hot springs are commonly found in volcanic regions, where magma heats underground water. Many cultures around the world have used hot springs for therapeutic purposes, enjoying their soothing effects. Popular destinations for hot springs include places like Japan, Iceland, and California.