In the watershed of the Volga (Kuybyshev Reservoir) it borders on the Tetyushsky, Kamsko-Ustinsky regions, along the waters of the Kama - with the Laishevsky District.

Most of the Spassky District is located on a low-lying plain, the average height of which does not exceed 60–70 meters, with a slight slope in the northwest direction.

The flag repeats the colors and the image of the coat of arms and depicts an ancient tower standing in a golden field.

In the second half of the 17th century, servicemen, archers, captured Poles, Chuvash and Mordovians began to resettle in the region.

At the time of formation, the district included 1 city and 41 village councils, 95 settlements, in which 52,504 people lived (46,231 Russians, 4641 Tatars, 1632 representatives of other nationalities).

Despite the relocation of one of its major cities, the Spassky district suffered greatly from flooding associated with the construction of the reservoir.

More than a hundred villages and the city of Spassk itself were submerfed, more than half of the archaeological monuments belonging to the period of the Volga Bulgaria and the Kazan Khanate were destroyed by water.

Thanks to the reform of the administrative-territorial division of the TASSR in 1965, the territory of the district increased to 2026 km², and the population was 38.7 thousand people.

[9][8] In 1991 the district was again renamed to Spassky while city of Kuybyshev received a name Bolgar in honor of the historic state.

[12] After him, the post of head of the district was occupied by the former director of the Bulgarian State Historical and Architectural Museum-Reserve Fargat Mukhametov.

The indicators improved thanks to a decrease in the unemployment rate from 0.76% to 0.39%, an increase in wages (up to 2.15% of the minimum consumer budget), an increase in the number of shipments of own-produced goods (3 billion compared to 2.6 billion in 2018 year), as well as the growth of the district's authority due to the opening of the Bulgarian Islamic Academy and the Kul Gali complex.

[17] In 2020, the amount of investments in fixed assets per capita reached 56 175 thousand rubles which become one of the lowest rates among the municipalities of Tatarstan.

Starting from 2015, local authorities launched the project "Cultural heritage - the island-town of Sviyazhsk and the ancient Bolgar" that attracted additional investments in the region amounting to 15.4 billion rubles, and the flow of tourists increased 18 times reaching 540 thousand visitors in 2017.

This project was supervised by the Vozrozhdenie fund and personally by Mintimer Shaimiev, with the main investors being Tatneft and TAIF.

There are also several a inter-municipal highway (Bolgar - Bazarnye Mataki, the Kim - Kuznechikha - Lesnaya Khmelevka (Ulyanovsk region) and several motorways which ensure the movement of cargo and passenger flows from west to east and from north to south inside republics and to the southern regions of the Volga Federal District.

Rare and endangered species on the territory of the region include iris sibirica, epipactis helleborine, salvinia natans.

The area is home to a anguis fragilis and vipera renardi there are 21 species of birds listed in the Red Data Books of Tatarstan and Russia.

[7] There are archaeological monuments from multiple eras in the region: the "Tankeyevsky burial ground" (IX-X centuries), "Settlement Suvar" (X-XIV), cultural and natural landscape "Armenian colony" (XIII-XIV), "Greek chamber" (XIV) and "Tract Aga-Bazar" (Neolithic), XIV-XV century.

Within the framework of this project the White Mosque was constructed, the world's largest printed Quran was ordered (the cover of which is decorated with emeralds), while the Museum of Bread and a monument on the tomb of the Sahab were also opened.

The opening of the academy took place in September 2017, and two years later, construction of a Muslim children's camp for schoolchildren from all over Russia began nearby.