抄録
To verify the description of the Nakaura Channel described in Izumo no kuni fudoki (the topography of Izumo Province), I reconstructed the topography of the lake bottom in the waters surrounding Eshima island using hydrographic charts from a survey conducted in 1952.
The result revealed that a tombolo existed in the Nakaura Channel, and the area of this tombolo during the Nara Era was reconstructed.
Furthermore, the lake shallows in the Eshima north water area and the remains of dredging work from the Edo to Meiji Era in the Eshima northeast water area were detected.
Reclamation efforts in Eshima were undertaken on the tombolo in the Edo Era and on the lake shallow in the Showa Era.
https://ror.org/01jaaym28 
