Zonal distribution of aquatic macrophytes was investigated in the littoral zone of Edosaki-iri Bay in Lake Kasumigaura. Muddy sediment with litter was deposited on the sandy bed near the shore line. In the emergent plant zone, Phragmites australis (Cav.) Trin. ex Steud. tended to dominate near the shore line, but was successively replaced by Zizania latifolia Turcz. and Typha angustifolia L. toward the deeper sites . The emergent plants were distributed on the shelf to a depth of 80 cm, while a

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... floatingleaved plant, Nymphoides peltata (Gmel.) O. Kuntze, occupied lakewards on the steeper slope from depths of 60 to 200 cm. Distribution of each species along the water depth gradient overlapped. The zonation of emergent plants was more associated with depth to sandy sediment surface than that with water depth and that with the thickness of muddy sediment.