Uvalas are large, irregular, contiguous hollow forms in karst areas. Since karst processes are very slow, even the emergence of Uvalas is a long process. They go back to the formation of sinkholes. When sinkholes expand laterally by progressive Subrosion or suffosion adjacent sinkholes can grow together to Uvalas. In nature Uvalas often look like an array of dishes in the soil.
One example is the Uvala Funtensees.