The present investigation was conducted to evaluate the pollution rates by petroleum oil and its effect on one of the most important and economic plant species; Avicennia marina (Forssk) Vierh .growing at three sites along the Red Sea Coast of Egypt; SI (south Safaga) S II (Wadi Abo Hamra) and SIII (Sharm El-Bahari). The total petroleum hydrocarbons were investigated in sediments, water and plants. Particle size distribution was determined for three microhabitats in each sites; habitate facing the sea shore (A), the middle of estuary (B) and the deltaic ridge of the estuary(C). Results of the present work indicated that the fine fractions of soil were the most dominant in each microhabitats of all sites. The total and individual hydrocarbons dominated in the fine sediments more than in the coarse ones. Also, results revealed that SI (south Safaga) was the most contaminated allover the studied sites. The plant heights recorded the least value at south Safaga site.