The Kongo River, locally known as Mwakamba, is one of the very few permanent freshwater rivers reaching the South Coast of Kenya. It rises in the coastal forest behind Ukunda and spills into the Indian Ocean at the northern end of Diani Beach, forming a wide, calm estuary framed by mangroves, casuarinas, and coconut palms. Beside the river mouth stands the coral-stone ruin of the Kongo Mosque, believed to date to the 14th–16th century. It is the last surviving Swahili mosque of the ancient Diani settlement and is still occasionally used for prayer, giving the site a rare living-heritage feel. Its low walls, mihrab, and slender minaret catch afternoon light beautifully. The estuary is a productive birding site: mangrove kingfishers, African fish eagles, herons, terns, egrets and, in migration season, ospreys and rollers. Sykes’ monkeys and vervets often move through the trees along the banks, and, on very quiet mornings, sightings of Nile monitor lizards on the mudflats are common. Kongo is one of Diani’s most atmospheric spots at sunset. Traditional dhows moor at the sandbar where the river meets the ocean, offering short sundowner cruises upriver into the mangrove tunnels; the water turns molten gold, and the mosque’s silhouette rises against a pink sky. The site is also a favorite for stand-up paddleboarders on flat river water, and for local fishermen who cast nets from dugout canoes in the estuary. Skynile combines Kongo with Bora Bora Wildlife Park, a Diani sundowner, or a Kaya Kinondo forest walk to build a full South Coast cultural circuit.