Islam and trade had closely linked the Negroes. And since it was easy for the merchant to practically call to Islam and guide people to it in the markets and villages, Islam played its natural role at the hands of these merchants among the Negroes in the South. The British colonial government announced its determination to fight the spread of Arab-Islamic culture in those environments. From here, the process of eradicating this Arab culture from those environments took place. The English administration went further in preventing the entry of Arab-Islamic cultural elements into all parts of the vast Sudan. Islamic cultural life left its clear mark throughout Sudan. For example, in the Nuba Mountains region, schools spread in the Nuba Mountains where Arabs mixed with the South, especially alongside the schools, many Quranic schools (khalawi) and mosques where children memorized the Holy Quran. Their people became Muslims, but they speak Arabic with a limited Arabic dialect. From here, in the northern mountain region alone, a group of Quranic schools emerged in Wad Al-Nih, Dubaykir, Al-Hamadi, Ras Al-Fil, and even Huquq. In addition to these Quranic schools, which contribute significantly to the spread of Islam and Arab-Islamic education, there are a group of stone-built mosques in Jabal Al-Nitel, Dulas, Sala Ra, and Wali. In these mosques, some sheikhs teach and memorize the Holy Quran and the sciences of jurisprudence. Alongside these mosques, there is a group of straw-built mosques scattered throughout the northern mountain region. These latter mosques are used for prayers only, especially Friday prayers. In addition to this, some Nubian groups in those mountains had become Arabized thanks to the spread of Arab-Islamic culture. These are the groups that lived and moved in the Islamic region, which was considered a stronghold.