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Obhur cre ek is located on the ea stern side of the Red Sea , 3S km north o f Jeddah. The hydrographic characteristics of the mean water circul ation pattern and the possibilit y of flushing of the cre ek into the Red Sea a re Investigated based on the collected dat a during the year 1990. Th e hydrographic structure showed eviden ce of thr ee water masses at the e ntrance of the creek: a surface water mass characterized by high temperatur e and salinity ; intermediate water mass distinguished by minimum salinity with core at 10-20 m depth a nd a bottom wat er mass that reaches maximum salinity. Thi s structure yields a two-layer flow at the e ntrance; inflow o f low salinity water at both surface and intermediate depths and outflow o f salter water at the bottom. Based on the water budget. the flushing time o f the cree k vari ed betw een one and four day s during the peri od of investigation. The creek waters were found to be near sa turation with d issolved oxygen and almost transparent, reflecting its oligotrophication.

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