As it is recently recognized that the Duanjie culture of China and the Krounovka culture of Russia are possibly identical, this culture had a more extended boundary. Therefore, the archaeological concept of this culture should be reviewed and a spatial range of this culture must be re-examined. In addition, as this culture is identified as ancient
Okjoe , determining boundary of this culture becomes a significant research issue to be resolved. In the northern and western frontiers, the Mudan River and the Hanka Lake regions, there was the Dongkang culture which is considered to be the local variation of the Duanjie-Krounovka culture. However, examination on the artifacts reveals that it should be regarded as a separate culture. In order to determine the northwestern boundary of the Duanjie-Krounovka culture, a comparative research with Dongkang culture has to be carried out. First above all, the chronology of the Duanjie-Krounovka culture including the sites located in the eastern part of North Korea should be established. The Duanjie-Krounovka culture is divided into three phases: PhaseⅠis dating to the fifth century BC; PhaseⅡis dating to the third century BC; Phase Ⅲ ranges from the first century BC to the first century AD Some dwellings of the Phase Ⅴ and Phase Ⅵ of the Beomuigusuk site, No. 6 dwelling of the Odong site and Phase Ⅳ of the Chodo site belong to Phase Ⅱof the Duanjie-Krounovka culture. Various studies indicate the date of Okjeo , documented in historical record, may correspond with Phase Ⅲ of Duanjie- Krounovka culture. The Dongkang culture of the Hanka Lake and the Mudan River regions is distinguished from the Duanjie-Krounovka culture. Potteries with U-shaped handles, stickshaped
handles, and triangle-shaped handles, and the outspread double-rimmed pot-teries are present in the Donkang culture whereas they are absent in the Duanjie-Krounovka culture. On the other hand, a steamer pottery, a large pottery, a dish on the high stand as well as Ondol , underfloor heating system, appeared only in the Duanjie-Krounovka culture. Such different pottery assemblages indicate a distinguished identity of each culture. The Duanjie-Krounovka culture ranges from the fifth century BC to the first century BC The Dongkang culture is distinguished from Duanjie-Krounovka culture. Thus the northern and western borders of the Duanjie-Krounovka culture should be the Suifen River, the Duman River, and the seaside of the Maritime Province, but it did not advance further to the Mudan River and the Hanka Lake regions.