Dibba Al Saiba Fort is an archaeological defensive Fortress in the state of Dibba, in Musandam Governorate. It has been built by the Portuguese, where its design was drawn between the drawings carried out by the Portuguese de Resende of Portuguese Fortressifications in the Gulf. Historical sources mention that Imam Nasser bin Murshid al-Yaraibi was the one who took over the Fortress when it wanted to tighten its control over Sohar and its castle 1043 AH (1633).
The Fort is a rectangle built with stones and Sarooj, It is surrounded by a wall of 64 meters long and 62 meters wide. The main entrance of the Fortress consists of a circular tower with a wooden door containing an inscriptions of 170 cm wide, 320 cm high, it is topped by a catcher to throw scorching liquids on the attackers. The tower has a staircase of Canadel wood. The tower is 890 cm long and 370 cm wide. Its first floor contains five holes in the shape of the horseshoe, four of which have small windows with circular arches. The roof of the tower is covered with canadal wood, it has light and upper ventilation openings “Marak”, and the thickness of its wall varies.
The tower has nine holes in the roof and the openings of "Marak" and Maram each of them, The door leading to the surface is covered with a 135 cm height and 68 cm wide. It is located near the main entrance in addition to the ring tower, the north-east tower, 605 cm high, 50 cm wide and 470 cm long. the entrance leading to its surface has boat-shaped arches of a 110 cm long, 80 cm wide, and a north-west tower with a length of 470 cm and a height of six meters. It has a room on the ground floor.
The Fort has another entrance, that has a covered passageway called "Sabah", topped by three boat-shaped arches. It is covered with kendall wood and sesame (a mat of wicker), it has pegs and openings with circular arches and terraces "Rkanat". there are close proximity four towers of equal size and height, which are connected by a 115 cm wide corridor. It has a small mosque on its border with plaster inscriptions and engineering circles.