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A Gram-staining-negative, aerobic, non-spore-forming, non-flagellated, non-gliding and rod-shaped bacterial strain, SSK3-3T, was isolated from the zone where the ocean and a freshwater spring meet at Jeju island, South Korea. Strain SSK3-3T grew optimally at 30 °C, at pH 7.0–8.0 and in the presence of 2.0 % (w/v) NaCl. Phylogenetic trees based on 16S rRNA gene sequences revealed that strain SSK3-3T clustered with the type strains of species of the genus Kordia , with which it exhibited 96.5–97.2 % 16S rRNA gene sequence similarity. Sequence similarities to the type strains of other recognized species were less than 92.2 %. Strain SSK3-3T contained MK-6 as the predominant menaquinone and iso-C15 : 0, iso-C17 : 0 3-OH, iso-C15 : 0 3-OH and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c) as the major fatty acids. The major polar lipids of strain SSK3-3T were phosphatidylethanolamine, one unidentified lipid and one unidentified glycolipid. The DNA G+C content of strain SSK3-3T was 34.9 mol% and the mean DNA–DNA relatedness with Kordia periserrulae KACC 14311T was 12 %. The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, revealed that strain SSK3-3T is separate from other species of the genus Kordia . On the basis of the data presented, strain SSK3-3T is considered to represent a novel species of the genus Kordia , for which the name Kordia jejudonensis sp. nov. is proposed. The type strain is SSK3-3T ( = KCTC 32426T = CECT 8368T). An emended description of the genus Kordia is also provided.