The Tano River — which runs 400 km from central Ghana into the sea along the Ghana-Côte d'Ivoire border — has its source at Traa, a suburb just north of Techiman. In Bono cosmology, this is among the most sacred spots on earth: Taakora, the highest of the Bono gods, is said to dwell at the river's source. The grove surrounding the source has been maintained as a ritual space for centuries.
The site is a forest patch in an otherwise heavily farmed landscape, with a small gorge where the river begins to cut through the rock. Traditional priests (akomfoɔ) associated with the Tano deity still conduct ceremonies here, and the grove functions as an active place of worship rather than a museum piece. Visitors are usually welcome with a local guide, and a small offering or fee is customary.
For context on what you are seeing: the Akan peoples of southern and central Ghana have long organized their religious life around river deities (bosom). The Tano deity is among the most powerful in the Akan pantheon, and Techiman's position at the river's source gives the town a religious authority that outlasted even the destruction of its political capital.
The source is about 5 km from the centre of Techiman. Taxis or tuk-tuks can take you to Traa; ask locally for the shrine caretaker.