| River Eresma | |
|---|---|
.jpg) The Eresma River as it passes through Los Redondillos (Los Huertos, Segovia) | |
 | |
| Location | |
| Country | Spain |
| Region | Castile and León |
| Physical characteristics | |
| Mouth | Adaja River |
• coordinates | 41°26′38″N 4°45′15″W / 41.44378°N 4.75404°W |
| Length | 134 km |
| Basin features | |
| Progression | Adaja→ Douro→ Atlantic Ocean |
The Eresma is a river in central Spain. It flows through Castile and León (specifically the provinces of Segovia and Valladolid). It has a total length of 134 km and drains a basin with an area of 2,940 km2.