In Biggles Works Overtime, El Bishra was an oasis and village just south of Jiddah (more commonly spelled Jeddah) on the Arabian Red Sea coast. El Bishra was the capital of a sheikdom ruled by Sheikh Ibn Usfa.
Eustace Bowden had stayed at El Bishra for a few weeks after a forced landing thee while serving as an R.A.F. pilot in a squadron based at Suakin on the Sudan Red Sea coast. Biggles also visited El Bishra on the trail of Bowden who had disappeared. There, Biggles learnt that Bowden had flown to El Bishra and had murdered the Sheikh and had stolen his collection of valuable pearls.
El Bishra is a fictional location.