Countries within a basin or region often face similar hydrometric challenges. Their capacities in tackling them can however vary significantly. In view of this, the WMO HydroHub organizes Learning Exchanges between countries to learn from each other how to address specific hydrometric challenges. Here, countries with advanced know-how will transfer their knowledge to countries needing support. These exchanges can also foster long-term support relationships between National Meteorological and Hydrological Services and establish other collaboration opportunities.