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Uvalas are formed when a number of smaller individual sinkholes coalesce into a compound sinkhole (Easterbrook, 1993). These landforms often are irregular in their overall shape, due to the merging of smaller sinkholes. Uvalas also tend to be shallow. Larger Uvalas have been seen to cover several square kilometers, with a depth of up to 200m (Easterbrook, 1993)

References: Easterbrook, D. (1993). Surface processes and landforms. (2nd ed.). Upper Saddle River, NJ: Prentice-Hall.