This document discusses groundwater management in the Syr Darya transboundary basin. It summarizes the increasing intensity of subsurface resource use, both conventional uses like groundwater extraction and newer uses like geothermal energy development, carbon capture and storage, and deep well injection. It categorizes different types of subsurface activities and their distributions. Key subsurface resources discussed include aquifers, oil and gas reservoirs, geothermal reservoirs, and deep saline formations used for injection and storage. The document stresses that decision-makers need a reliable understanding of the benefits, costs and risks of different subsurface activities to properly manage subsurface resources and activities.