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Modern Standard Arabic (الفصحى al-fuṣḥā) is the primary official language used in the government, legislation, and judiciary of countries in the Mashriq region. Mashriqi Arabic is used for almost all spoken communication, as well as in television and advertising in Egypt and Lebanon, but Modern Standard Arabic is used in written communication. In Lebanon, where Mashriqi Arabic was taught as a colloquial language as a separate subject under French colonization, some formal textbooks exist.
The varieties of Mashriqi have a high degree of mutual intelligibility, especially between geographically adjacent ones (such as Lebanese and Syrian or between Iraqi and Kuwaiti). On the contrary, Maghrebi dialects, especially those of Algeria and Morocco, are harder to understand for Arabic-speakers from the Mashriqi ones, as it derives from different substrata.
Singer, Hans-Rudolf (1980) “Das Westarabische oder Maghribinische” in Wolfdietrich Fischer and Otto Jastrow (eds.) Handbuch der arabischen Dialekte. Otto Harrassowitz: Wiesbaden. 249–76.