Keren is predominantly Muslim, which gives it a different texture to the highland Eritrean cities further east, and the main mosque at the center of town reflects that character. Several mosques serve the city, but the main one is where the Friday prayers draw the largest gatherings — the surrounding streets fill up on Friday mornings in a way that makes the city's religious life hard to miss even if you're just passing through.
Non-Muslim visitors are generally welcome to observe from the exterior, and the mosque's position near the market means it is easy to encounter naturally rather than making a special trip. The call to prayer heard across Keren five times a day is one of the clearest signals that you are in a different part of Eritrea — the sound carries across the granite hills and gives the city an auditory backdrop quite unlike Asmara.