The castle is built in a plain field after a regular rectangular plan with dimensions 60 x 90 m built. In the middle of each corner’s wall it has a tower (except of the west wall, which building belongs to a second period). The towers are circular, or rectangular in plan, covered by wood roofs and provided with portholes in the ground level. At first the walls were 9 m high, but today they look much lower because of the alluviums of the Shkumbini River’s floods. The width of the walls vary from 1 m to les then 0,5 m. They have no canon beds, while the lower portholes seem to have been made for fire-arms. Builders have put pieces of brick and tiles in between irregular sandstones and pudding-stones of the walls. There are architectural fragments from the Byzantine period, like pieces of columns, bases and capitols used as usual stones. The entrance to the castle is on the west, from the sea side, with two round towers, left at the northwest and northeast corners. Some ruins at the south corners seem to have been rectangular towers. The south wall is much damaged. The inner side of the walls is shaped by a system of pilasters 1x1,5 m every 3m from each. The pilasters are joined by arches of bricks 0,4 m high, reinforced by wood spans, over which it is built the “guards’ walk” of 1,2 m width. The full height of the walls including the parapet was 9 m. The parapet is 0,8 m wide and 1,9 m high. There are arrow loops 0,5 m high in the parapet’s wall, with an inner width 0,35 m and outer width 0,15 m. There are two rows of arrow loops in the blind arches between the pilasters, creating in this way, three fighting levels along the walls. The ground level loopholes are bigger than the others serving so for small canons Their height is 1 m, the inner width 0,95 m and the outer width 0,35 m. The two levels in the blind arches were divided by wood platforms, which joist’s traces are still shown on the pilasters’ sides.

The towers are round, or rectangular. Two towers in the corners are round, the third is rectangular, while the fourth is ruined down and no traces are preserved. The all intermediate towers are rectangular. Their walls are 1,25 – 1,4 m thick, while their height is up to 12 m. The walls of the round towers come down with a slight slope outside, while those of the rectangular towers are vertical. The towers are opened from the inner side of the castle and have many arrow loops. They had wood floor divisions in five storey, which communicated by the stairs inside them. Each storey had a very low space. Some of these spaces were adapted for habit by adding smokestacks at a later period. There were wood constructed machicolations (projections in the battlements of the walls) with openings through which the bottom of walls could be controlled, when it was impossible to see them by the neighbor towers. The machicolations were directed by the upper floors, while the fourth floors of the corner and intermediate towers were connected by doors directly with the “guards’ walk”. Their covers were occasionally conic, or prismatic shape built by wood construction covered with tiles or lead. Canon loopholes are usually built in the two bottom floors, while the upper floors end with a teeth-shape parapet provided with arrow loops, like those over the walls. A roof rested on the teeth-shape parapet. This kind of construction reflects that the roofs were demountable if it was needed.

The castle had three entrances, judging by the tracks left. The main entrance was in the middle of the north wall through a rectangular tower. Another entrance is in the middle of the rebuilt west wall, but it is not known for sure if there was a previous entrance from this side. The third entrance was at the north side of the east wall, through one of the blind arches between two pilasters. The defense of this entrance was made by a round tower in the corner. The span of the door was 2,7 m covered by a lintel. This door was closed by a wall at a later period.There are some stairs in the castle, leading to the “guards’ walk”. The stairs are built by stone walls joined to the inner side of the walls of the castle. The resting place of the stairs, serving for its communication with the “guards’ walk”, was built over a brick cylindrical vault. In some cases there are arrow loopholes under the stairs. The general order for building the stairs was to reach easily first the “guards’ walk” and not the upper storey of the towers. The solders moving on the “guards’ walk” was to be made in one direction, too. It is for this reason that the direction of the stairs is opposite to the towers. Continuity of the “guards’ walk” it is not interrupted besides in the entrance tower. There are built stairs in each side of the tower, by which could be passed from one wall walk to the other without losing time. Meanwhile in the middle towers there are stairs at the both sides of their cylindrical vaults, serving also to the wall walk and to the towers at the same time. The west wall seems to have been built later than the other parts of the castle and this second building phase must have been in 18th c. During his journey in 18th c. the Turkish traveler, Evliya Çelebi has not seen that the west wall of this castle was ruined by the floods of the river, because this wall was not rebuilt until 1762.