Named coto on the lower Río Lozoya below the Pinilla reservoir, run by the Sociedad de Pescadores Molino de la Horcajada. Tramo I — roughly 3.5 km — is catch-and-release, fly-only (artificial fly, perdigones, or streamers), all barbless. The dam releases above keep the water cooler than the surrounding lowlands well into summer, which is the main reason this stretch fishes through August when most of central Spain is unfishable. Stocking influence is present and pressure varies by weekend, so treat it as a managed Spanish coto rather than wild headwater fishing.
- Granite