Mentioned by Byron in 1810-07-29. The Isthmus of Panama, also historically known as the Isthmus of Darien, is the narrow strip of land that lies between the Caribbean Sea and the Pacific Ocean, linking North and South America. Wiki
Named by Byron as visited 1810-07-29. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis, which belonged to Megara in archaic times, before being taken by Athens. Wiki
Named as visited by Byron to Hobhouse 1810-07-29. In antiquity, Keos (Latin: Ceos), is a Greek island in the Cyclades archipelago in the Aegean Sea. Wiki
"I left Constantinople with Adair at whose audience {of leave} I saw Sultan Mahmout, and obtained a firman to visit the Mosques of which I think I gave you some
description in my last letter ..."