Smith's Bible Dictionary
Kir of Moab
(fortress of Moab ), one of the two chief strongholds of Moab, the other being Ar of Moab. The name occurs only in ( Isaiah 15:1 ) though the place is probably referred to under the names of Kir-heres, Kir-harseth, etc. It is almost identical with the name Kerak , by which the site of an important city in a high and very strong position at the southeast of the Dead Sea is known at this day. Its situation is truly remarkable. It is built upon the top of a steep hill, surrounded by a deep and narrow valley, which again is completely enclosed by mountains rising higher than the town and overlooking it on all sides.
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Smith, William, Dr. Entry for 'Kir of Moab'. Smith's Bible Dictionary. http://www.studylight.org/dictionaries/sbd/k/kir-of-moab.html. 1901.