O Spot that art situate on the shores of the two seas! ¶89
This is a reference to Constantinople, now called Istanbul. Located on the Bosphorus, a strait about 31 kilometres long which links the Black Sea and the Sea of Marmara, it is the largest city and seaport of Turkey.
Constantinople was the capital of the Ottoman Empire from 1453 until 1922. During Bahá’u’lláh’s sojourn in this city, the tyrannical Sultan ‘Abdu’l-‘Azíz occupied the throne. The Ottoman Sultans were also the Caliphs, the leaders of Sunní Islám. Bahá’u’lláh anticipated the fall of the Caliphate, which was abolished in 1924.