The land where the mosque now stands was once an industrial sawmill operated by PT Inhutani I, a state-owned forestry company. In 2001, the Provincial Government of East Kalimantan acquired the site and began planning what would become one of the largest mosques in Southeast Asia, second only to Jakarta's Istiqlal Mosque. The location was no accident: it sits along the Mahakam River in the Teluk Lerong Ulu subdistrict of Sungai Kunjang, placing the mosque at the spiritual and geographic heart of Samarinda. Funding came exclusively through the East Kalimantan Provincial Budget, with the total cost reaching approximately 400 billion rupiah allocated across multiple budget years. The project involved formal approvals from provincial officials and religious leaders, including representatives from the Indonesian Ulema Council's East Kalimantan chapter. The mosque was inaugurated in 2008.

The numbers are everywhere, and none are arbitrary. The main tower rises 99 meters across 15 floors, each averaging 6 meters in height, making it a landmark visible for kilometers along the Mahakam. Four corner minarets reach 70 meters, while two gate minarets stand at 57 meters. Together, the seven towers create a skyline that dominates Samarinda from virtually every approach. The building's footprint is immense: 43,500 square meters of total building area, with a ground floor of 10,270 square meters and a main prayer floor of 8,185 square meters. A mezzanine balcony adds another 5,290 square meters. Beneath it all, a 10,235-square-meter basement and 7,115 square meters of supporting structures complete the complex. The mosque can accommodate over 10,000 worshippers for Friday prayers, and its architectural influences blend Middle Eastern and Turkish design traditions with elements reminiscent of the Blue Mosque in Istanbul and the Masjid Nabawi in Medina.

Seen from the Mahakam Bridge, the mosque presents its most dramatic face -- the massive dome and seven minarets reflected in the river that has defined Samarinda for centuries. The Mahakam has been a highway for the Dayak people, the Kutai sultanate, Dutch colonizers, Japanese occupiers, and the coal barges that fuel modern Kalimantan's economy. Along its banks, Islam arrived in the 16th century through Javanese preachers, and it has shaped daily life ever since. The mosque's position on the river connects it to this long spiritual lineage. On Friday afternoons, when the call to prayer echoes across the water and thousands of worshippers fill the prayer hall and overflow onto the grounds, the building fulfills the vision its planners intended: a place where the scale of devotion matches the scale of the landscape. In a province where fortunes rise and fall with commodity prices, the mosque is meant to endure as something coal money built that transcends coal.

For visitors approaching Samarinda by air or river, the mosque is the first landmark that registers. Its minarets pierce the canopy of a low-slung tropical city, and the dome catches equatorial light in ways that shift throughout the day. But the building is more than a monument. The complex functions as a community center, educational facility, and gathering place. The basement floors house meeting rooms and administrative offices. The grounds host religious celebrations, community events, and the daily rhythm of five prayer times that structures life across the Islamic world. East Kalimantan's identity has long been defined by extraction -- of timber, coal, oil, and gas. The Samarinda Islamic Center Mosque represents a different kind of investment: not in what lies beneath the ground, but in what a community believes rises above it.