The creek is formed not far from the centre of
Testico from the union of several streams descending the eastern slopes of Monte Torre (990 m). At first it flows down heading East and then turns South towards the
Ligurian Sea. Close to its mouth, which is located in Marina di Anrora, the Marula is crossed by
Autostrada dei Fiori,
Genoa–Ventimiglia railway and
State highway nr.1 (
Via Aurelia). The Merula
basin (49
km2) is wholly included in the
Province of Savona.
Main tributaries •
Right hand: • rio Moltedo • rio Domo; • left hand: • rio Tigorella, • rio Metta. == Nature conservation ==