Santiago–Tuguegarao Road

Santiago–Tuguegarao Road
Santiago–Tuguegarao Road
	The Ramon, Isabela segment of the road, with Route 51 sign
Route information
Length	130 km (81 mi)
Component; highways	N51;
Major junctions
South end	AH 26 (N1) (Maharlika Highway) / R.C. Miranda Road in Mabini, Santiago
	N224 (Banaue–Mayoyao–Alfonso Lista–Isabela Road) in Ramon, Isabela; N53 (Santiago–Tuguegarao Bypass Road) in Cabatuan, Isabela; N53 (Santiago–Tuguegarao Bypass Road) in Cabatuan, Isabela; N220 (Cabagan–Santa Maria Road) in Santa Maria, Isabela; N52 (Kalinga–Cagayan Road) in Enrile, Cagayan; N106 (Tuguegarao Diversion Road II) in Buntun, Tuguegarao; N107 (Tuguegarao Diversion Road I) in Ugac Sur, Tuguegarao; N107 (Tuguegarao Diversion Road I) in Balzain East, Tuguegarao;
North end	AH 26 (N1) (Cagayan Valley Road) / N106 (Tuguegarao Diversion Road II) in Tanza, Tuguegarao
Location
Country	Philippines
Provinces	Cagayan, Kalinga, Isabela
Major cities	Tuguegarao, Santiago
Towns	Ramon, San Mateo, Cabatuan, Aurora, San Manuel, Roxas, Mallig, Quezon, Rizal, Santa Maria, Enrile, Solana
Highway system
	Roads in the Philippines; Highways; Expressways List; ;

Santiago–Tuguegarao Road is a major national primary road in the provinces of Cagayan, Kalinga, and Isabela in the Philippines. It is a bypass road of the Pan-Philippine Highway, also known as Cagayan Valley Road, connecting to the cities of Tuguegarao and Santiago.

The road is designated as National Route 51 (N51) of the Philippine highway network.