The Yuriev-Polsky Kremlin, once a wooden fortress, was located on the low left bank of the Koloksha River, not far from the mouth of the Gza River. Today, the white-stone St. George's Cathedral, built by Vladimir Prince Svyatoslav Vsevolodovich between 1230 and 1234, has been preserved on its territory. The Mikhailo-Arkhangelsky Monastery and the Trinity Cathedral are also located here.

The Kremlin occupies an almost round area of about 7 hectares, surrounded by a high earthen rampart 1 km long, 7 m high, and 12 m wide at the base. The rampart is entirely made of earth on an ancient surface. It features three gaps that form gates leading to the roads to Vladimir, Pereslavl-Zalessky, and Moscow. Behind the fortress walls was the posad, where residents took refuge in case of enemy attacks. The cultural layer, ranging from 0.6 to 1.6 m thick, contains deposits from the mid-12th century. Fragments of pottery, slate spindle whorls, keys, and shards of glass bracelets have been found in the lower layers. The defensive structures were studied by P. A. Rappoport and M. V. Sedova.