The hyporheic zone is a crucial ecosystem that exists between the surface water and groundwater. It is vital for maintaining the biodiversity and health of aquatic ecosystems, and is often referred to as the interstitial or subsurface zone. Other synonyms for this zone include the groundwater-surface water interface, the interstitial zone, and the riverbed filter zone. It is also commonly referred to as the benthic zone, which includes the bottom of the body of water but can also extend into the surrounding substrate. The hyporheic zone is an incredibly important habitat that provides a wealth of ecosystem services, including nutrient cycling, water purification, and the support of numerous plant and animal species.