The Bonsa River is a small but historically significant river in the Western Region of Ghana, near Tarkwa, and it has become one of the country's most cited examples of a local water source degraded by mining activity — particularly by illegal small-scale mining, known locally as *galamsey*. The Bonsa rises in the forested hills around the Tarkwa–Nsuta–Prestea belt, one of the richest gold-bearing areas in Ghana and the heartland of both large-scale and artisanal gold mining. It flows through communities such as Bonsa, Huni Valley and the wider Tarkwa-Nsuaem municipality before joining the Ankobra River system. For the people living along its banks, the Bonsa has long served as a source of drinking water, bathing, fishing and irrigation for small farms — which is precisely why its pollution has been so painful. The damage follows a familiar pattern across Ghana's mining districts. Galamsey operators dredge and wash ore directly in the riverbed, releasing heavy sediment that turns the water turbid and brown. Mercury, used to amalgamate fine gold, and cyanide from some operations leach into the water. The result is water that is unsafe to drink, fish that disappear, and riverbeds gouged into craters. Communities along the Bonsa and neighbouring rivers have reported skin irritations, and treatment plants — including those serving Tarkwa and nearby towns — have struggled with high turbidity, sometimes forcing rationing or reliance on sachet and bottled water. This is not an isolated problem. The Bonsa sits within the same crisis that has hit the Ankobra, the Pra, the Offin, the Birim and the Densu. Ghana's water utility, Ghana Water Limited, has repeatedly warned that galamsey is pushing treatment costs up and threatening supply to cities far downstream. The Tarkwa area is especially sensitive because mining is the economic lifeblood of the district — so the tension between livelihoods, gold revenue and clean water is sharper there than almost anywhere else. The response has come in waves: military-led "Operation Halt" deployments to clear illegal miners from riverbeds, the dissolution and reconstitution of anti-galamsey taskforces, and repeated government pledges to protect water bodies. Enforcement has been uneven, and the practice has repeatedly rebounded when attention shifts. Civil society — including groups like ActionAid Ghana, which this week renewed its call for communities, women and youth to be placed at the centre of mineral governance — argues that lasting solutions require local voices in decisions about the rivers they depend on, not just periodic crackdowns. For anyone living along the Bonsa today, the practical reality is that untreated river water should be treated as unsafe. If you're in the Tarkwa–Bonsa area and relying on the river, boiling does not remove mercury or dissolved metals — only proper treatment or an alternative source will do. The deeper fix, as the Akan proverb puts it, *"Se wo were fi na wosan kofa a, yenkyi"* — there is no shame in going back for what you left behind: Ghana once managed these rivers well, and returning to that discipline is the only path that restores the Bonsa for the communities that depend on it.