The Anseba River flows flows from the Eritrean Highlands to the plains Sudan. It travels for 346 km passing from just outside Asmara through Keren. It merges with the Barka River which flows through Agordat. Asmara Asmara (formerly Asmera) is the capital city and largest settlement in Eritrea, home to a population of around 579,000 people. ... Keren is the third largest city in Eritrea, lying north west of Asmara, with a population of around 75,000 people. ... Agordat is the capital of the Gash Barka province of Eritrea. ...