The Kongo Mosque, a quiet sentinel overlooking the northern fringes of Diani Beach, is far more than a simple place of worship—it is a tangible, living piece of East Africa's ancient Swahili and Islamic heritage. Thought to be one of the oldest mosques along the entire East African coastline, its foundation dates back to the 13th or 14th century, a testament to the powerful influence of early Arab traders and merchants who frequented the coast.

Originally known as the Diani Persian Masjid, and sometimes cited as the Tiwi Mosque, the structure embodies the architectural fusion of its era. It was constructed using local coral rag stone, a common and resilient material in traditional Swahili coastal architecture. The original design, though simple, is deeply historical, featuring longitudinal barrel vaults and a mihrab (prayer niche) that resembles the early classic style of other ancient coastal sites like Shanga. These features reflect the simplicity and craftsmanship of the builders who established this community outpost centuries ago.

Following a period of desertion after the initial Arab departure, the mosque was slowly enveloped by the lush coastal forest. It was eventually rediscovered and rehabilitated approximately 300 years ago by a local Muslim scholar, Sheikh Mwenye Kombo, who was reportedly guided to the overgrown site in a dream. It was upon its reopening that it was renamed the Kongo Mosque, believed to be in honour of a faithful Muslim named Swaddiq Kongo, who was allegedly buried within the compound.

Today, the mosque is recognized as a national monument and remains an active, vital center of community life. Despite minor modern additions to accommodate a growing number of worshippers—such as a recent extension to the eastern wing—the original coral structure has been carefully preserved, creating a striking contrast between the old and the new.

The mosque’s secluded and serene location enhances its spiritual and historical appeal. It is nestled amongst ancient, monumental Baobab trees, which stand like silent guards, and is situated near the scenic estuary where the Kongo River flows into the Indian Ocean. This confluence of nature and history makes the site a profound and picturesque destination, offering visitors not just a glimpse into a centuries-old past, but also a peaceful spot for reflection near the beautiful Diani shoreline. Visitors are welcomed but are reminded to respect its sanctity by dressing modestly.