Hot springs are natural geothermal springs that produce water heated by the Earth's internal heat. They are often referred to as spas, THERMAE, or geysers. The term 'SPA' is a four-letter word used to describe a resort with hot springs, while 'SPA' is a three-letter word used to describe a mineral spring. Geysers are seven-letter words used to describe a type of hot spring that intermittently erupts hot water and steam. THERMAE is also a seven-letter word used to describe a hot spring or a public bath. Hot springs are popular tourist destinations due to their therapeutic properties and natural beauty.