This tree is named for its barrel-shaped trunk, and is the oak which reaches the greatest trunk circumference among the Białowieża oaks.

Beside a large platanus tree (trunk circumference 4.5 metres) and beside the old chapel of St. Basil are the ruins of ancient buildings.

Mitchell's Rule states: "If there are tree stumps or felled trunks nearby, count the annual growth rings and measure the trunk circumference to find local growth rates".

A tree has three crucial measurements: height, trunk circumference and crown spread.

The scenic viewpoint is the location of the "Octopus Tree", a large, multi-trunked Sitka Spruce with a trunk circumference of about 50 feet.

At the time of registration (circa 1940), the tree's trunk circumference was 14 feet (4.3 m).

Although the various species are notoriously silent on the subject, children will be taught to determine a tree's age by measuring trunk circumference, which grows a certain amount annually.

Where one-quarter or less of the trunk circumference has been girdled, it may not be necessary to use this technique.

The oak has a trunk circumference of 690 centimeters.

Beech tree, trunk circumference 2.50 m, on the edge of the path in the Marschbach valley between Wallenborn and Niederstadtfeld.