Cape Santiago is located about 6.8 kilometres (4.2 mi) southeast of the Port of Calatagan where ferries bound for Lubang Island operate.

It is 91 to 116 metres (299 to 381 ft) high, wooded, and fringed by a drying reef extending 0.16 kilometres (0.099 mi) offshore.

[2] A lighthouse marks a low rocky promontory about 0.5 miles (0.80 km) west-northwest of the south extremity of the cape.

[1] The lighthouse at Cape Santiago is the oldest structure in Calatagan built in the 1890s during the Spanish colonial period.

Made of brick and lime cement, this red round structure is 51 feet (16 m) tall modeled after the medieval castles in Europe.