Scattered: this small leech has been found rather constantly in two bodies of water in the Okoboji region, Little Miller's Bay and Little Emerson's Bay, West Okoboji Lake.
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West Lake Okoboji's clear, cold waters are a relief from the heat, but take some getting used to. The sand beaches at Terrace Park, on the southern end of the lake, provide some of the most refreshing waters for swimming in the area.