TOPOGEAPITY OF THE SAGAMI SEA. 7 



On the chart (PI. XIV), which I have prepared taking ns 

 basis the latest hydrographie charts published by the T. J. 

 Navy,'-' I have put down the 10 to 500 fathom-lines along the 

 coast as well as could be done. The 500 fathom-line is reached 

 at a distance from the shore varying at different places from 

 4Yo to 20 kilometers. The deepest soundings recorded are from 

 two isolated spots in Sagami Bay. The one, 908 fathoms deep 

 and known to fishermen under the name of Suribachi, is situated 

 onh^ 5 kilometers to the south of the mouth of Banyü Hiver. 

 Just 10 kilometers farther south lies the other spot, 970 fathoms 

 in depth and known as Umanokiira. Both appear to be crater- 

 like depressions surrounded on all sides by shallower waters. 



To judge from what few soundings we have, the Central 

 Basin of the Sagami Sea seems to present quite an uneven 

 bottom, ranging from 400 to 700 fathoms and more in depth 

 at different points. Between Izu and Vries Island, a narrow 

 trough, one point in which gives a sounding of 810 fathoms, 

 probably leads out uninterruptedly into the great ocean basin 

 to the west of the submarine plateau on which the Seven Islands 

 of Izu are situated. On the south-eastern side, the Central Basin 

 seems to be separated from the Goheba Basin (situated between 

 Cape Mera and Vries Island, presumably sloping down outwards 

 to the abyssal basin of Tuscarora) by a bottom much disturbed 

 by submarine elevations that cause considerable shallowness of 

 water in certain places. The most important of these is the 

 submarine ridge known by the name of Okinosê, of which I 

 shall soon speak again. The presence of comparatively shallow 



* For a number of soundings on Okinose and neighborhood, which do not stand in 

 the published liydrographic cliitrts but have been given in I'l. XIV, I am indebted to 

 tlie courtesy of Eear-Admiral KiMOTSKi of the IIydrograj)]iy, I. J. N., who kindly placed 

 them at my disposal. 



