Map of Azerbaijani Khanates and Russia's Military Operations in the South Caucasus 1809-1817

 

The map indicates Azerbaijani khanates and the Lake of Gekcha (Azerbaijani: Gökçe)/ Sevanga. The Russified name Sevanga originates from the Sasanian name (Pahlavi: Sivāng-e/ Sivān) meaning "blue water", Legend in Russian. 

High resolution image available at:  https://runivers.ru/mp/maps-detail.php?ID=468665

Карта военных действий в Закавказском крае с 1809 по 1817 год. (runivers.ru)

Azerbaijan's Iravan and Nakhcivan Khanates and the Lake of Gekcha/ Sevanga (Pahlavi: Sivāng-e), legend in Russian.

The Armenized name "Sevan" is a corrupted form of the Sasanian name "Sivāng-e/ Sivān  (Pahlavi/Middle Persian), meaning blue water.