Memorial sign "Tulumbas" (Ukrainian: Пам'ятний знак "Склик" ) is a memorial to nature and history created for the National Historical and Cultural Preserve "Chyhyryn", located in the Kholodnyi Yar reserve. A large round copper cooking vessel was fixed to a big oak tree at this historical place long ago. A strong ringing was heard at a long distance when somebody would hit against the vessel with a stick.The sound convened local Cossacks for a meeting. Recently a drum (tulumtas) made of granite was established here as a monument to local avengers and their leader Maksym Zaliznyak.