Cut to Kashmir.
In 8th century, King Jayapida, grandson of Lalitaditya, called upon the engineers from Sri Lanka (in Rajatarangini, in typical Kashmiri manner, called "Rakshasas") to build water reservoirs in Kashmir. Jayapida's pet project was a sort of water fort called Dvaravati (named after Krishna's Dwarika).
Alexander Cunningham, the 19th century British archaeologist identified Andarkut near Sumbal as Dvaravati.
He was wrong and had only discovered half-a-city. A few years later George Buhler while looking for Sanskrit Manuscripts in Kashmir was lead rightly by a boatman to a nearby place called Bahirkut which he was able to identify due to its geography as Dvaravati.
Dvaravati was a two part fort. Exterior called Bhayyam Kottam and interior called Abhayantaram. Abhayantaram was the proper Jayapur, the city Jayapida founded and Dvaravati - the outer fort.
That would explain the names Bahir (outer) kut and Andar (inner) Kut.
An indication of how the names change in a fertile place like Kashmir.
If you Google search now. You will not find Andarkut but 'Inderkot' near Sumbal. And nothing on Bahirkot.