Cluster of thick-walled defensive fortifications and ancillary structures positioned on the coast. The site (MAHS-IDN-ACH-ABS-MRY-S-001) consists of four main well-built rectangular structures. Two of the walled fortifications are intact and in good condition (restored by BPCB), while the other two are ruined foundations. There are a number of supporting features built within or in close proximity to the main defensive fortification, such as wells. Some of the features are surrounded by standing water and a canal.

(MAHS-IDN-ACH-ABS-MRY-S-001-F010) Feature 10 is a large, well-constructed fortification that is roughly square in shape. It is approximately 27 meters on each side for a total contained area of approximately 700 square meters. The walls are made from stones bounded by mortar and concrete. The exterior walls are slightly slanted, wider at the base than at the top. The front and side walls of the fort are higher than the back walls. There is a corridor attached to the wall on the front and sides. It is raised higher than the ground level on the inside. This fort has high, sturdy walls with embrasures on each side. There are three embrasures on the front, and three on each side. There are two embrasures on the back that are level with the ground. The embrasure can serve for the placement of cannons. The top has a flat floor surface. There are three building rooms at the top, one room in the middle, and two rooms attached to the front side wall that connected to each embrasure. The room in the middle is rectangular with an elongated semi-circular arched roof. It has one access door from the southeast. The other two rooms attached to the wall have almost the same shape. One side of the wall is open without a door. At first glance, it looks like a short passage. The floor of the room is composed of stone masonry. This fort has no permanent access stairs.