Remote sensing technologies are valuable tools for water resources management and flood protection. Satellites, drones, and airborne sensors can be used to collect hydrologic data such as precipitation, soil moisture, reservoir storage, snowpack, river flows, and lake levels, even in not easily accessible areas. Satellite data on vegetation indices and soil moisture anomalies help assess drought severity and optimize irrigation, thus enhancing crop yields and reducing water waste. Remote sensing also supports the estimation of water quality and pollution in freshwater and marine systems. In flood management, remote sensing methods provide real-time flood monitoring and post-flood damage assessment. The current issue of Hydrolink includes six articles that describe different remote sensing applications for addressing water challenges in different regions of the world.