Water / Soil / Ground Environment
State of Japan's Environment at a Glance: Japanese Lake Environment - Japanese Lakes
Japanese Lakes
| Surface Area (1995 Science Yearbook) |
km2 |
| Biwa Lake | 670.5 |
| Kasumigaura Lake | 167.6 |
| Saroma Lake | 150.4 |
| Inawashiro Lake | 103.3 |
| Nakanoumi Lake | 86.8 |
| Kussharo | 79.4 |
| Shinji Lake | 79.2 |
| Shikotsu Lake | 78.4 |
| Toya Lake | 70.7 |
| Hamana Lake | 65.0 |
| Caspian Sea (The largest salt lake in the world, Russia and three other countries) | 371,000 |
|---|---|
| Lake Superior (The largest fresh water lake in the world, Canada/USA) | 82,367 |
| Maximum Depth (1995 Science Yearbook) |
m |
| Tazawa Lake | 423.4 |
| Shikotsu Lake | 360.1 |
| Towada Lake | 326.8 |
| Ikeda Lake | 233.0 |
| Mashu Lake | 211.4 |
| Toya Lake | 179.7 |
| Chuzenji Lake | 163.0 |
| Kuttara Lake | 148.0 |
| Ozero Baykal (Russia) | 1,741 |
|---|---|
| Lake Tanganyika (Tanzania and three other countries) | 1,470 |
| Water Volume | ||||
| Natural Lakes | hundred million m3 |
Reservoirs | hundred million m3 |
|
| Biwa Lake | 275.0 | Okutadami Reservoir | 6.0 | |
| Shikotsu Lake | 209.0 | Tagokura Reservoir | 4.9 | |
| Toya Lake | 81.9 | Miboro Reservoir | 3.7 | |
| Towada Lake | 41.9 | Kuzuryu Reservoir | 3.5 | |
| Inawashiro Lake | 38.6 | Ikehara Reservoir | 3.4 | |
| Kasumigaura Lake | 8.0 | Sakuma Reservoir | 3.3 | |
| Shinji Lake | 3.7 | Sagami Reservoir | 0.6 | |
| Ozero Baykal (Russia) | 230,000 | Owen Falls Reservoir (Uganda) | 2,040 | |
|---|---|---|---|---|
| Aswan High Dam Reservoir (Egypt/Sudan) | 1,690 | |||
| Water Transparency (Lake Environment in Japan, II) |
m |
| Mashu Lake | 28.0 |
| Kuttara Lake | 22.0 |
| Aka-numa Lake | 18.2 |
| Shikotsu Lake | 18.0 |
| Panke Lake | 14.0 |
| Onuma-ike Lake | 13.5 |
| Suga-numa Lake | 13.2 |
| Usoriyama Lake | 13.0 |
| Penke Lake | 11.3 |
| Motosu Lake | 11.2 |
| Rokkannon-miike Lake | 11.1 |
| Ozero Baykal (Russia,1911) | 40.5 |
|---|---|
| Lakes with a high level of transparency are often oligotrophic or acidotrophic lakes formed by natural damming or volcanic activities. |
| Water Retention Time | ||||
| Natural Lakes | years | Reservoirs | years | |
| Shikotsu Lake | 51.2 | Okutama Reservoir | 0.68 | |
| Akan Lake | 25.9 | Kamafusa Reservoir | 0.18 | |
| Towada Lake | 8.5 | Kojima Reservoir | 0.07 | |
| Biwa Lake | 5.5 | Sagami Reservoir | 0.05 | |
| Inawashiro Lake | 3.8 | |||
| Kasumigaura Lake | 0.55 | |||
| Shinji Lake | 0.25 | |||
| Tega-numa Lake | 0.08 | |||
| Lago Titicaca (Peru/Bolivia) | 1343 | |||
|---|---|---|---|---|
| The average retention time for the world's lakes has been calculated as 1.2 years (retention time of reservoirs is generally shorter). | ||||
[Origin of Lake]
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