Some coastal communities east of the Sierra Madre Mountains, especially from Palanan, Isabela heading north to near the northernmost tip of mainland Cagayan, are remote and isolated with no roads connecting them to towns west of the mountain range. Towns like Palanan, Divilacan and Maconacon, Isabela can only be reached by plane from Cauayan City or a boat ride from Aurora province, south of Isabela or from Santa Ana, Cagayan, north of the province. Ilagan City - Divilacan road traversing the Sierra Madre mountain is about to be completed.