Djibouti is a country located in the Horn of Africa. It is bordered by Eritrea in the north, Ethiopia in the west and south, and Somalia in the southeast. The remainder of the border is formed by the Red Sea and the Gulf of Aden at the east. Djibouti occupies a total area of just 23,200 km2 (8,958 sq mi). In antiquity, the territory was part of the Land of Punt. The Djibouti area, along with other localities in the Horn region, was later the seat of the medieval Adal Sultunate and Ifat Sultanate. In the late 19th century, the colony of French Somaliland was established following treaties signed by the ruling Somali and Afar Sultans with the French. Djibouti is a multi-ethnic nation, with a population of over 790,000 inhabitants. The Somali and Afar make up the two largest ethnic groups. Both speak Afro-Asiatic languages, which serve as recognized national languages. Arabic and French constitute the country's two official languages. About 94% of residents adhere to Islam, a religion with a long-standing presence in the region. There is not much seasonal variation in Djibouti's climate. Hot conditions prevail year-round along with winter rainfalls. Mean daily maximum temperatures range from 32 to 41 °C (90 to 106 °F), except at high elevations, where the effects of a cold offshore current can be felt. The Goda Mountains lie northwest of the Gulf of Tadjoura, Tadjoura Region in Djibouti. They rise to 1,750 metres (5,740 ft) above sea level and are the nation's largest heavily vegetated area. The ecology of this landform is considered an isolated outlier of the Ethiopian montane forest ecological zone, an important island of forest in a sea of semi-desert. Lake Assal (literally translated to honey lake) is a crater lake in central-eastern Djibouti. It is a saline lake which lies 155 m (509 ft) below sea level in the Afar Triangle, making it the lowest point on land in Africa and the third lowest land depression on Earth after the Dead Sea and Sea of Galilee. There is no outflow from the lake and, due to high evaporation, the salinity level of its waters is ten times that of the sea, making it the most saline in the world after Don Juan Pond.