Opishnia hillfort is situated on a high, elongated hill over the right bank of the Vorskla river and its right tributary, the Tarapunka river. Defensive walls hardly could be seen on the modern surface as the monument cis onstantly being ploughed, its NE part destroyed by a quarry, SE line of the walls appeared to be under the dirt road, an old cemetery and World War II pits are situated on the hillfort’s southern part. The modern square of the hillfort is near 4.1 ha.

A survey trench measuring 14 × 1 m was dug out through the defensive walls on the hillfort’s SE part. The authors outline four periods in the construction of the fortifications. However, they say nothing about the features of the rampart.

Ditch 1 was supplemented with a escarpe on a steep slope. The ditch was 1.48 m deep and 1.48 m wide. A clayey layer 0.5 m thick and filled with pieces of charcoal traced on the bottom.

Ditch 2 measuring 6.92 m deep and 8 m wide was dug out after making a new escarpe closer to a hillfort’s plateau. The inner smooth slope had several steps while the inner slope with a line of a wooden palisade was vertical.

When ditch 2 was partly silted up, a new line of the palings was set directly in the alluvial layer that was 0.5 – 1.8 m thick. The palisade was made of wooden logs 0.5 m thick. The postholes were fixed in a line with a distance near 0.6 m between them. A small number of artefacts was found here: just cattle bones and pieces of pottery.

Ditch 3 was dug out when construction of the new escarpe had filled the previous ditches. The last ditch had a flat bottom and was 6.8 m wide. Several pieces of handmade pottery were found in the filling of the ditch. Besides that, a single 5th – 4th c. BC arrowhead is notable here. It is the only dating finds for this hillfort.