This briefing pack provides some of the latest evidence and information about groundwater, along with key messaging and resources. In this pack we discuss the UK’s Water action at COP26; programme activities around water and climate, water governance, finance, and gender and the UK’s well developed water ‘offer’, that together, can help reach the goal of global water security. Groundwater is water found underground in aquifers which, although hidden from view, are vital to agriculture, economic growth, nature and health. Groundwater is an especially important source of water as rainfall varies due to Climate Change. The sections in this briefing pack are: UK position on water; UK water offer; Latest innovation and developments around groundwater; Supported networks for knowledge, connection and opportunities; Water as a strategic climate asset; Water governance; Water finance; Water Finance and Water Risk Filter; Gender and water; GCRF Water Security and Sustainable Development Hub – case studies; Upcoming events and networks; Key reading; Key videos.