Abstract
1. The Tugaru Zyûniko Lake Group is situated in the small valleys and small basins on the marine terraces at the southwestern corner of Aomori Prefecture. The lake group consists of 33 lakes, including small ponds.
2. The topography of the region is hilly. The water system is rather abnormal. The formation of the region is pearlitic tuff in which the lake basins have been excavated.
3. All the lakes are very small. There are only 12 lakes whose areas exceed 1 hectare. Even the largest lake, Ôike has an area of only 9.1 hectare. These water surfaces total 46 hectares.
4. These lakes were sounded in the summer of 1934 from a portable rubber boat. They are very deep in spite of their small water surfaces. The maximum depth (27-3m) was found in Ôike. The bottom configuration was fairely complex in some lakes.
5. Half of the lakes have no outlet.
6. The northern and southern lakes (Kosiguti-ike and the Ôike hake Groups) and the middle lake group (ItobatakeRike and the Menkozaka-ike Lake Groups) are distinguished for their peculiar morphology and hydrology as seen in a table at following page.
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