Mareb River in the context of "Mereb Melash"

Eritrea, officially the State of Eritrea, is a country in the Horn of Africa region of East Africa. Its capital and largest city is Asmara. The country is bordered by Ethiopia to the south, Sudan to the west, and Djibouti to the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The country has a total area of approximately 117,600 km (45,406 sq mi), and includes the Dahlak Archipelago and several of the Hanish Islands.

Hominid remains found in Eritrea have been dated to 1 million years old and anthropological research indicates that the area may contain significant records related to human evolution. The Kingdom of Aksum, covering much of modern-day Eritrea and northern Ethiopia, was established during the first or second century AD. It adopted Christianity around the middle of the fourth century. Beginning in the 12th century, the Ethiopian Zagwe and Solomonid dynasties held fluctuating control over the entire plateau and the Red Sea coast. Eritrea's central highlands, known as Mereb Melash ("Beyond the Mereb"), were the northern frontier region of the Ethiopian kingdoms and were ruled by a governor titled the Bahr Negus ("King of the Sea").

Tigray Province (Tigrinya: ትግራይ), also known as Tigre (Amharic: ትግሬ tigrē), was a historical province of northern Ethiopia that overlaid the present day Afar and Tigray regions. Akele Guzai borders with the Tigray province. It encompassed most of the territories of Tigrinya-speakers (and a few minority groups) in Ethiopia. Tigray was separated from the northern Tigrinya speaking territories by the Mareb River, now serving as the state border to Eritrea, bordering Amhara region in the south.

The great majority of inhabitants were Orthodox Christians (95.5% in 1994), with the exception of a small, but important Muslim subgroup (Jeberti) and a few Catholics (mainly Irob). Protestantism is only a very recent urban phenomenon. Despite a general impression of ethnic and cultural homogeneity, there were a few ethnic minorities, especially at the borders of Tigray, belonging to a non-Tigrinya groups, such as the Saho-speaking Irob at the north-eastern border to Eritrea, the people|Raya in the south-east, the Agaw-speaking H̬amta in Abergele north of Wag, a few Kunama in the Habesha Kunama woreda east of Humera, and scattered peripheral groups in the western lowlands across the tekeze, such as the Chare of the Sellim Bet (related with the Gumuz) and Tukrir in the Humera area.

The Eritrean Highlands are a mountainous region in central Eritrea. Bordered to the south by the Mareb River. It is a northern continuation of the Ethiopian Highlands mainly inhabited by Tigrinya speaking people. The region has seen tremendous deforestation since the colonial period, which began in the late 19th century. The Highlands are at particular risk of deforestation and associated soil erosion. Furthermore, the region, lying south of the Sahel are at particular risk of desertification and frequent drought. The Highlands experience, as most tropical regions, two seasons; the rainy season (kremti) is from June–September while the dry season (haggai) is from September to June. The average temperature for Asmara, which is 2,340 m (7,677 ft) above sea level, is approximately 16 °C (61 °F), but other places range from about 10 to 25 °C (50 to 77 °F).