his study was conducted on a naturally growing mangrove population at Ras Mohammed and Nabq protected areas, South Sinai, during the period 20052006. Avicennia marina is the only growing mangrove species in South Sinai. Its structure, litterfall and seedling distribution were investigated. The total area of mangrove stands is 99.1 hectares with 42% canopy coverage, average tree height is between 1.7 - 2.6 m, basal area up to 9.2 m 2 . ha -1 . Ras Mohammed represents the densest stand (428 stems ha -1 ). An annual litterfall of 2036.7 Kg. ha -1 . yr -1 was recorded at Rowaiseya with a maximum peak during April. Mangroves at Nabq area have well distribution of seedlings over Abu Zabad site and a localized dense aggregation of seedlings in intertidal areas at Monqataa and Gharqana sites with a seedling density up to 1848 ha -1 .