N51 highway (Philippines)

Santiago–Tuguegarao Road
The Quezon, Isabela-segment of Santiago–Tuguegarao Road.
Route information
Length	130 km (80 mi)
Component highways	N51 (Tuguegarao to Santiago)
Major junctions
North end	AH26 / N1 (Maharlika Highway) – Tuguegarao City, Cagayan
	N52 (Kalinga–Cagayan Road) – Enrile, Cagayan N220 (Cabagan–Santa Maria Road) – Santa Maria, Isabela N53 (Cauayan–Cabatuan Road) – Cabatuan, Isabela N224 (National Highway Junction–Potia Road) – Ramon, Isabela
South end	AH26 / N1 (Maharlika Highway) – Santiago
Location
Major cities	Tuguegarao, Santiago
Highway system
Roads in the Philippines Highways Expressways List ← N11 N52 →

Roads in the Philippines

Santiago–Tuguegarao Road is a major road in the provinces of Cagayan and Isabela in the Philippines. It is a bypass junction of the Pan-Philippine Highway, connecting to the cities of Tuguegarao and Santiago. The entire road is a component of National Route 51 (N51), a national primary route of the Philippine highway network.