But when the Marib Dam was built and the influence of those states waned, the Sabaeans and their descendants moved north into the Arabian Peninsula in a vast migration. Following this, the Islamic conquests occurred, transferring large groups of them to the most fertile lands in Egypt, the Levant, the Maghreb, Andalusia, Iraq, Persia, and other Islamic countries.

Therefore, after the spread of Islam and the widespread Sabaean migration throughout the Arabian Peninsula, it can be said that the Bab-el-Mandeb Strait could be considered a secondary passage for the Arab migration to Sudan. This is because, with the spread of Islam, other passages and gateways opened up for the extensive migration to Sudan, where the Nile Valley route from Egypt was the primary gateway for the spread of Arab tribes into Sudan, along the Nile Valley.

Despite the Nile Valley crossing being considered the primary crossing for the Arab migration to Sudan, there are still Sudanese narratives that are repeated, stating that many Arab tribes in their migratory movement, or that large numbers of those tribes that migrated to Sudan, came from the Arabian Peninsula directly across the Red Sea to the coast facing the Hejaz directly in the Islamic era (the Hejaz route).

Perhaps these Sudanese narratives intended to express the purity of the Arab origins that migrated directly to Sudan, and thus they came to Sudan directly from their first cradle.

There is no disagreement regarding the movement and migration of Arab tribes that filled the Arab lands across their vast expanse. Their movement originated from their first cradle, the Arabian Peninsula, whether from the south, north, or central Arabian Peninsula. 34