The Lozoya drops from the Sierra de Guadarrama's southern slopes into a deep, granite-walled valley that models chalk-stream precision in mountain form. Three managed cotos—Angostura (Coto I, May to July), Rascafría (Coto II, April onwards), and Alameda (Coto III, March onwards)—offer catch-and-release water with structured access, though all close Thursdays. For walk-up fishing without a coto permit, the CyS corridor between Cotos II and III provides legitimate angler relief, though space is limited. TPE I (Riosequillo, Tue/Wed/Sat fishing with mandatory reporting) serves as an experimental alternative. Cold, clear freestone with technical runs and pocket water demands dry fly and tight-line nymphing; wild brown populations reward precision presentation with barbless single hooks and thoughtful wading.
- Granite