Liquid regions refer to areas on a planet or celestial body where liquid, typically water, exists. These regions can be found on Earth, where oceans, lakes, and rivers are prime examples. In the context of other planets, liquid regions may include subsurface oceans on moons like Europa or Enceladus, where liquid water is believed to exist beneath icy crusts. The presence of liquid regions is crucial for understanding the potential for life beyond Earth. Scientists study these areas to assess habitability and the conditions that allow liquid to remain stable. The exploration of liquid regions helps inform our knowledge of planetary geology and climate.