The Dact-el-Mayun (), also known as the Western strait, the large strait, the large pass or the wide pass, is the western section of the Bab-el-Mandeb straits, which separates Ras Menheli, Yemen, on the Arabian Peninsula from Ras Siyyan, Djibouti, on the Horn of Africa. The strait has a width of about and a depth of . The Yemeni island of Perim divides the strait into two channels, Bab Iskender and Dact-el-Mayun respectively.William James Lloyd Wharton, John Phillips (1900), The Red Sea and Gulf of Aden Pilot page 230. Great Britain Hydrographic Office.
Near the African coast lies a group of smaller islands known as the Seven Brothers.
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