Great Mosque of Algiers

Engineering for Seismic Resilience

  Located on the central axis of Algiers, the capital of Algeria, the Djamaa el Djazaïr mosque complex spans 400,000 square meters and comprises 12 buildings, including a prayer hall, a minaret, an Islamic school, etc. It is the largest and tallest building in Africa and the third largest mosque in the world.

A Landmark on the Mediterranean Coast

  Located on the central axis of Algiers Bay, the capital of Algeria, the Great Mosque stands along the Mediterranean coast. Covering a total floor area of 400,000 square meters, it comprises 12 buildings, including the prayer hall and a 265-meter-high minaret—the world's third-largest mosque after the holy sites of Mecca and Medina, and the tallest religious structure in the world. Serving as Algeria's premier venue for religious gatherings, worship, cultural exchange, and tourism, it can accommodate 37,000 worshippers at once and welcome up to 120,000 visitors daily.

• World's Tallest Religious Structure: The minaret of the Great Mosque stands 265 meters high while the mosque itself ranks as the largest in Africa and the third largest globally.

• Africa’s Largest Mosque: With a total floor area of approximately 400,000 square meters, it is hailed as Algeria's "millennium project."

• World's Largest Indoor Prayer Hall: The prayer hall spans about 31,000 square meters, making it the largest indoor prayer hall in the world of any mosque, accommodating up to 36,000 worshippers.

Algeria's "millennium landmark"

  The project is often referred to locally as Algeria's "millennium landmark." It serves not only as a place of worship but also as a center for cultural and scholarly activity. The complex was featured on Algeria's 1,000 and 2,000 dinar banknotes in 2019 and 2022, respectively, and was recognized as one of the world's most beautiful architectural works in 2021. On the 60th anniversary of Algeria's independence, the site hosted the country's largest‑ever military parade.

Custom‑Engineered Expansion Joints for Seismic Demands

  The site lies on the Mediterranean–Himalayan seismic belt, requiring the project to meet extreme seismic design standards. A seismic isolation system was developed for the long‑span, large‑scale structure to address the region's high seismic risk. This placed stringent demands on structural components. ROABY solution on expansion joint engineered to meet seismic requirements exceeding Zone 9 intensity. The system's multidirectional movement capability accommodates the complex displacement demands of seismic events while maintaining structural integrity under crowd loading.

Key Figures

World's tallest religious structure

Expansion joints engineered for seismic demands beyond Zone 9 intensity