Study area.

<p>Map of Ghana with the Offin river valley and surrounding countries. The 13 study communities along the Offin River are indicated as multicolored dots: Bedomase (BDS); Krakrom (KKS); Kapro (KPS); Akomfore (AFS); Ntobroso (NBUS); Achiase (ABUS); Keniago (KGS); Tontonkrom (TNS); Dominase (BUDS); Wromanso (WMS); Nkotumso (NKS); Mfantseman (MFS); Pokukrom (PKS). The grey lines in the Ghana map indicate the borders of the Ghanaian regions. The background maps were created using the <i>ArcMap</i> program in <i>ArcGIS</i> v.10.0 and were modified with Adobe Photoshop CS6.