where sheba was is debatable
Actually, not really. Most of the sources I've read indicate Saba (Sheba) was a south Arabian Peninsula kingdom fairly well-known in the ancient world. Its capitol was Ma'rib in what is now Yemen, a major oasis and caravan stop on the spice route from Oman. The Sabaeans ruled from around the 10th to around the 3rd Centuries BCE. The kingdom finally collapsed after its control of the trade routes fell apart and following conquest by the Himyarite Empire.