Surface area is a country's total area, including areas under inland bodies of water and some coastal waterways.
| 1970 | 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Azerbaijan | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 | 86,600 |
| Kazakhstan | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,902 | 2,724,900 | 2,724,900 | 2,724,902 | 2,724,902 |
| Kyrgyz Republic | 199,950 | 199,950 | 199,950 | 199,950 | 199,949 | 199,949 | 199,949 | 199,949 | 199,949 | 199,949 | 199,950 | 199,950 | 199,950 | 199,949 | 199,950 | 199,950 | 199,950 | 199,950 |
| Turkiye | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 | 785,350 |