Which kingdom of organisms is found in harsh environments such as hot springs salt lakes areas with no oxygen?

The kingdom of organisms typically found in harsh environments such as hot springs, salt lakes, and areas with no oxygen is Archaea. These microorganisms are known as extremophiles due to their ability to thrive in extreme conditions that would be inhospitable to most life forms. They possess unique biochemical and genetic features that enable them to survive in environments with high temperatures, salinity, or acidity.