The Kalbario–Patapat Natural Park is a protected area in the Philippines, located on the Patapat Mountains in the municipalities of Pagudpud and Adams in northern Ilocos Norte province.

Protected area

The natural park was established on April 20, 2007, by Proclamation no. 1275 encompassing 3800 ha with a buffer zone of 1937 ha. The park was created under the National Integrated Protected Areas System (NIPAS) of the Department of Environment and Natural Resources.

Patapat Viaduct

In the northern section of the park is the Patapat Viaduct, a 7 km highway and part of the Pan-Philippine Highway, allowing travel along the sheer cliffs of the northern coastal mountains of Ilocos Norte overlooking the coast of Pasaleng Bay. Part of the viaduct is an elevated highway between the cliffs and shore constructed to solve the problems of landslides during heavy rains causing accidents or closures.