The Oyolo District is located in the Cordillera Volcánica in the northeast of the province of Páucar del Sara Sara. It has a length of almost 47 km in a SSW-NNE direction and a maximum width of almost 30 km. The districtcovers the uppercatchment area of the Río Oyolo, which flows through the area in a south-southwesterly direction and later empties into the Río Huanca Huanca.