Several natural lakes exist , mainly Spirit Lake , West Okoboji Lake and East Okoboji Lake in the northwest Iowa ( `` see Iowa Great Lakes '' ) . Several natural lakes exist , most notably Spirit Lake , West Okoboji Lake , and East Okoboji Lake in northwest Iowa ( `` see Iowa Great Lakes '' ) .
Beberapa tasik semula jadi wujud, terutamanya Tasik Spirit, Tasik Okoboji Barat dan Tasik Okoboji Timur di barat laut Iowa ("lihat Tasik Besar Iowa"). Beberapa tasik semula jadi wujud, terutamanya Tasik Spirit, Tasik Okoboji Barat, dan Tasik Okoboji Timur di barat laut Iowa ("lihat Tasik Besar Iowa").