Corbicula leana, known as chamjaecheop (; "true jaecheop") in Korean and as mashijimi (; "true shijimi") in Japanese, is a species of freshwater and brackish water clams, distributed in the Korean Peninsula and the Japanese archipelago.
Three nominal species are synonymized with C. leana: C. arata (Sowerby, 1877), C. poppei Thach & Huber, 2021, and C. noetlingi Martens, 1899. The invasive lineage "form B/Rlc" (COI haplotypes FW1/FW4) corresponds to C. leana.
Culinary use In Korean cuisine, Corbicula leana are used in a clam soup known as jaecheop-guk.
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