Fort Kalamata, Portuguese coastal fort in Ternate City, Indonesia.

Fort Kalamata is a roofless coastal fort built by the Portuguese in 1540 at Kayu Merah on the southeastern corner of Ternate, about 1 km south of Bastiong. Its four pointed bastions face the cardinal directions, each with firing niches, and the plan resembles a turtle when seen from above. The walls are laid in andesite and coral bound with lime mortar.

Portuguese forces built this fortress in 1540 to control the spice trade, particularly cloves, which were valuable commodities of the era. Dutch forces took control of it in 1610 as they expanded their colonial presence in the region.

The fort took its name from Prince Kalamata, the brother of Sultan Madarsyah, replacing the original Portuguese name Santa Lucia. This change reflects how local rulers left their mark on structures built by foreign powers.

The fort stands on the coastline at the south-eastern corner of Ternate, about 1 km south of Bastiong, on the edge of the water. From the rear of the structure you look across to Tidore and Maitara islands. The site is open to the public.

Seen from above, the roofless fort reads as a turtle or sea turtle, its four pointed bastions facing the cardinal directions. The walls mix andesite and coral stone bound with a mortar of burnt coral, sand and water soaked in lubiri tree bark. The shape carries no special meaning according to local accounts.