It is the largest and oldest oak in the Dieveniškės Historical Regional Park. Oak trunk volume is 4.98 m, diameter 1.6 m and a height of 26 m. Just by the  Grybiškių Oak the largest Boletus mushroom in Lithuania have been found, which is registered in Lithuanian record book. Boletus weight was 3.05 kg, caps diameter of 49 cm.

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