Sumgait is a city in Azerbaijan, located near the Caspian Sea, on the Absheron Peninsula, about 31 kilometres away from the capital Baku…Sumgait is a city in Azerbaijan, located near the Caspian Sea, on the Absheron Peninsula, about 31 kilometres away from the capital Baku. The city had a population of 427,000 at the beginning of 2024, making it the second largest city in Azerbaijan after Baku.