This site (MAHS-IDN-ACH-ABS-MRY-S-004) is the remains of a fortification built on a headland rising steeply from the coast. The western boundary is a cliff bordering the sea, the north and south is a small valley, while to the east is a ridge.
The fort is orientated toward the sea, as evidenced by the presence of cannon embrasure placed on the west wall. From there, it has an open view across the bay. 
The fort is an open square with three walls each on the west, north, and south sides. The west wall still stands firm, in contrast to the other side. This wall is composed of andesite stone with lime mortar adhesive. The north wall is only survived by the foundation made from andesite stone material mixed with chunks of coral lime. The south wall is reduced to stone ruins that extend for about 52 meters. Some parts still look like the original structure, the arrangement of andesite stone arranged as a wall without lime plaster. Inside the fort, there are three gravestones, not in situ, just lying around. Other features visible on this site are stone mounds and the foundations of structures toward the southern valley. In the northern valley, closer to the coast, there are many ceramic sherds visible on the surface (Daly, et al. 2019).

(MAHS-IDN-ACH-ABS-MRY-S-004-F-001)
This feature is the perimeter wall of the Inong Balee fort. The shape is like an open U. It can be divided into three parts, the west, south, and north wall. The west wall that stands on a cliff bordering the sea. This wall extends north-south along 53 m with a wall height between 1 - 2.7 m. Most of the walls still stand, but many parts have cracked and some have collapsed. This wall has at least four cannon windows, two of which are still clearly visible, while the other two have collapsed. These openings are spaced at regular intervals along the wall. The base of the wall is on the same level as the ground. 
 The wall is about 2 meters wide, with the bottom wider than the top. The outer side of the wall is inclined towards the inside. 
The wall are composed of andesite stone with lime-plaster.
The south is different from the west wall. It is a stone structure without lime-plaster that extends east-west about 52 m along the contour on the upper boundary. This wall has collapsed leaving only stone ruins which are scattered around and into the valley below. Some of the original formations can still be seen at the bottom. The east end is connected to a structure that leads to the south about 8 meters long. It is a foundation structure of limestone.
The south wall is a continuation of the west wall that cuts perpendicular to the south corner. At the bottom of the south corner, there is a structure connected with a lime-plaster, but the rest is a stone structure without the lime-plaster.
In the north, there is a wall that extends west-east. It extends along the contour on the upper boundary with the valley on the north. Some of it has been restored by BPCB. The wall has been restored to about 10 meters from the northwest corner to the north. There is a massive wall composed of andesite stone and cement-plaster 2.1 m wide and 89 cm high. From the wall, the structure is connected to the north for about 25 m. This structure survives in the form of a foundation composed of stone with lime-plaster adhesive and looks like a barrier or revetment to prevent landslides. At the east end, the wall is connected to a foundation that runs west-east. The foundation is composed of chunks of limestone, arranged lengthwise following the contour for approximately 30 m.