These kids were playing on a boat and another was washing his clothes. All along the shore you see children, women, and men either playing in the water for recreation, gathering water in tubs, washing clothes, washing themselves, cleaning dishes, and who knows what else. Lake Malawi has been known to infect people with the parasitic disease of Schistosomiasis, or Bilharzia. The water becomes contaminated when infected people urinate or defecate in the water. Where I snorkeled it's a bit cleaner because we kayacked to an island but I'm still at risk and crossing my fingers.
This is a top pick!