The Minho runs through the municipality and derives secondary manifolds, which are Azúmara, the Lea, and Anllo. Climatically, Castro de Rei has a temperate climate with abundant rainfall in the winter months.
The Minho river flows through the municipality, creating branches that are named Azúmara, the Lea, and Anllo. Castro de Rei has a temperate climate with abundant rainfall during the winter months.