Ras Siyan: the volcanic peninsula of the Obock region

Where is Ras Siyan?

Ras Siyan is a peninsula in the Obock region, on the Bab el-Mandeb strait — the meeting point between the Red Sea and the Gulf of Aden, at the southern entrance to the Red Sea. It lies about twenty kilometres south-west of Perim island.

A word on the name. This place is spelt in several ways depending on the source: Ras Siyan (our spelling, aligned with this page’s address), Ras Siyyan in the official designation of the Unesco biosphere reserve, and Ras Syan in the Dalmar catalogue. It is the same cape, and if you are looking for a trip, it is under those different spellings that you will find it.

Its shape explains everything else. Ras Siyan is not an island: it is a reddish volcanic hill, about 1.2 kilometres long and 500 metres wide, peaking at 138 metres, which a low sand spit links to the mainland. That spit stretches south for about five kilometres, widening from 500 to 800 metres.

The Dalmar catalogue ties this area to the record for the Seven Brothers marine protected area, whose address carries the mention “Ras Syan” and the Obock region.

What can you see on the peninsula?

Three environments overlap in a very small space.

The volcanic hill. Reddish, it dominates the strait. The volcano is inactive, but young: it is described as having pierced a coral formation 21,000 years old, which gives the whole an unusual profile.

The sand spit. This is the tongue of sand attaching the cape to the mainland. The National Tourism Agency describes a fine sand beach two kilometres long there, frequented by turtles and crustaceans, and a seabed that forms, with the mangrove, a nursery where many fish species concentrate.

The bay and its mangrove. West of the cape opens a shallow marshy bay, about 2.5 kilometres wide, protected to the north by coral banks. It is bordered by white mangroves (Avicennia marina) and abundant seagrass beds, notably of the genera Halodule and Thalassia. An isolated white rock, Siyyan Rock, stands in the bay about 800 metres south-west of the hill.

Reference	Data	Source
Region	Obock	Dalmar catalogue
Location	Bab el-Mandeb strait, about 20 km south-west of Perim island	Wikipedia (en)
Relief	Reddish volcanic hill about 1.2 × 0.5 km	Wikipedia (en)
High point	About 138 m	Wikipedia (en)
Link to the mainland	Sand spit about 5 km long	Wikipedia (en)
Bay	About 2.5 km wide, protected by coral banks	Wikipedia (en)
Vegetation	Mangrove of Avicennia marina, beds of Halodule and Thalassia	Wikipedia (en)
Beach	Fine sand over about 2 km	ANT
Marine protected area	447.1 km², or about 27% of the country’s coastal fringe	Dalmar catalogue

Is the cape part of the Seven Brothers?

Yes, in toponymy at least. The cape’s hill is sometimes counted as the seventh brother of the archipelago, the six other islands lying 4.5 to 14.5 kilometres to the east. That explains the name of the sector’s marine protected area.

That marine protected area is documented in the Dalmar catalogue as covering 447.1 km², or about 27% of the country’s coastal fringe. It holds natural coral reefs, seagrass beds and preserved mangroves, in a shallow marine zone where hydrodynamic conditions have favoured a rare biodiversity: sharks, sea turtles, dugongs and migratory birds.

The page Seven Brothers archipelago details the islands themselves and their dive sites; Ras Siyan is their landward endpoint.

Why is this sector important for biodiversity?

Because it adds together environments rarely found side by side: reefs, seagrass beds, mangroves and coastal desert. Unesco’s Man and the Biosphere programme designated the whole “Seven Brothers archipelago – Ras Siyyan – Khor Angar – Godoria” as a biosphere reserve in 2025.

The figures published by Unesco give the measure of the site: 272,160 hectares in total, of which 197,574 hectares marine and 74,576 hectares terrestrial, with more than 970 species recorded, 12 marine mammals, more than 520 reef fish species and 238 coral species, of which 32 threatened. The mangroves of Ras Siyan, Khor Angar and Godoria are described as the largest and most diversified in the country.

The sector is also one of the world’s most important raptor migration corridors: between 85,000 and 245,000 birds of prey pass through each year. The emblematic species cited are the dugong, the whale shark and the sooty falcon.

A detail useful to anyone interested in wildlife: sharks breed in the bay of Ras Siyan, where they are reported in October. The area also supports communities of Afar fishermen and herders, between small-scale fishing, pastoralism, date palm cultivation and salt gathering.

How do you visit Ras Siyan?

The cape is discovered from the sea, as part of boat trips organised in the Seven Brothers sector: diving, snorkelling, wildlife watching. The sources consulted describe no road access to the peninsula, and no visitor structure on site.

Three practical points before setting off:

• This is the end of the world, not an equipped beach. Nothing is described on site: bring your water, your food and something to shelter from sun and wind.
• The bay is shallow and the mangrove fragile. Do not cut mangroves, do not stir up the sediment, throw nothing from the boat.
• Keep your distance from the wildlife. Turtles, dugongs and sharks are not to be chased, and the bay serves as a nursery for many species.

The sector combines naturally with the town of Obock and the Godoria mangrove, and with a day of diving in Djibouti for those who come for the seabed.

What is the best period to go?

The most comfortable window runs from November to March, when the north coast is ventilated and the sea generally calm. From May to September, heat and wind make trips gruelling, and wildlife watching loses its interest in the hot hours.

To set your dates, the page when to go to Djibouti gives the month-by-month detail. If you are aiming for whale sharks rather than the cape, note that the season for that species is shorter and does not coincide exactly with the climatic window: the page diving with whale sharks details that calendar.