Astrakhan in the context of "A–A line"

Operation Barbarossa was the invasion of the Soviet Union by Nazi Germany and several of its European Axis allies starting on Sunday, 22 June 1941, during World War II. More than 3.8 million Axis troops invaded the western Soviet Union along a 2,900-kilometer (1,800 mi) front, with the main goal of capturing territory up to a line between Arkhangelsk and Astrakhan, known as the A–A line. The attack became the largest and costliest military offensive in human history, with around 10 million combatants taking part in the opening phase and over 8 million casualties by the end of the operation on 5 December 1941. It marked a major escalation of World War II, opened the Eastern Front—the largest and deadliest land war in history—and brought the Soviet Union into the Allied powers.

The operation, code-named after the Holy Roman Emperor Frederick Barbarossa ("red beard"), put into action Nazi Germany's ideological goals of eradicating communism and conquering the western Soviet Union to repopulate it with Germans under Generalplan Ost, which planned for the removal of the native Slavic peoples by mass deportation to Siberia, Germanisation, enslavement, and genocide. The material targets of the invasion were the agricultural and mineral resources of territories such as Ukraine and Byelorussia and oil fields in the Caucasus. The Axis eventually captured five million Soviet Red Army troops on the Eastern Front and deliberately starved to death or otherwise killed 3.3 million prisoners of war, as well as millions of civilians. Mass shootings and gassing operations, carried out by German paramilitary death squads and collaborators, murdered over a million Soviet Jews as part of the Holocaust.

Atyrau (UK: /ˌætɪˈraʊ, -ˈrɔː/, US: /ˌɑːtɪˈraʊ, -ˈrɔː/; Kazakh: Атырау, pronounced [ɑtəˈrɑw] ; Russian: Атырау), known until 1991 as Guryev (Russian: Гурьев), is a city in Kazakhstan and the capital of Atyrau Region. Atyrau is a transcontinental city, at the mouth of the Ural River on the Caspian Sea, between Europe and Asia, 2,700 kilometres (1,700 miles) west of Almaty and 351 kilometres (218 miles) east of the Russian city of Astrakhan.

Atyrau is famous for its oil and gas industries. It has a population of 355,117 as of 2020. It is predominantly made up of Kazakhs, the minorities being Russians, Koreans, Tatars and Uzbeks.

The Volga Delta is the largest river delta in Europe and occurs where Europe's largest river system, the Volga River, drains into the Caspian Sea in Russia's Astrakhan Oblast, north-east of the republic of Kalmykia. The delta is located in the Caspian Depression—the far eastern part of the delta lies in Kazakhstan. The delta drains into the Caspian approximately 60 km (37 mi) downstream from the city of Astrakhan.

The Volga delta has grown significantly in the 20th century because of changes in the level of the Caspian Sea. In 1880, the delta had an area of 3,222 km (1,244 sq mi). Today the Volga Delta covers an area of 27,224 km (10,511 sq mi) and is approximately 160 km (100 mi) across. It has a classical "delta pattern". The delta lies in the arid climate zone, characterized by very little rainfall. The region receives less than one inch of rainfall in January and July in normal years. Strong winds often sweep across the delta and form linear dunes. Along the front of the delta, one will find muddy sand shoals, mudflats, and coquina banks.

Astrakhan Oblast (Russian: Астраха́нская о́бласть, romanized: Astrakhanskaya oblastʹ) is a federal subject of Russia (an oblast) located in southern Russia. Its administrative center is the city of Astrakhan. As of the 2010 Census, its population was 1,010,073.

The Cathedral of Vasily the Blessed (Russian: Собор Василия Блаженного, romanized: Sobor Vasiliya Blazhennogo), known in English as Saint Basil's Cathedral, is an Orthodox church in Red Square of Moscow, and is one of the most popular cultural symbols of Russia. The building, now a museum, is officially known as the Cathedral of the Intercession of the Most Holy Theotokos on the Moat, or Pokrovsky Cathedral. It was built from 1555 to 1561 on orders from Ivan the Terrible and commemorates the capture of Kazan and Astrakhan. It was completed, with its colours, in 1683.

The original building, known as Trinity Church and later Trinity Cathedral, contained eight chapels arranged around a ninth, central chapel dedicated to the Intercession; a tenth chapel was erected in 1588 over the grave of the venerated local saint Vasily (Basil). In the 16th and 17th centuries, it was perceived as the earthly symbol of the Heavenly City. Like all churches in Byzantine Christianity, the church was popularly known as the "Jerusalem" and served as an allegory of the Jerusalem Temple in the annual Palm Sunday parade attended by the Patriarch of Moscow and the Tsar.