The ‘Şark Kale’ (= Eastern Castle) is a massive bastion at the junction of the inner and outer citadel.
Byzantine, 7th & 9th century, and restored a number of times (also recently).
The construction is polygonal on the outside, but oval on the inside.

Correspondent: J.M.Criel, Antwerpen
Source: ‘Guides Bleus: Turquie’ – Edition 1986.