Lake Okabena is a small lake located in Nobles County in southwestern Minnesota. It was first noted on a map made by French explorer Joseph Nicollet in 1841, based upon his explorations of the 1830s. The name okabena means "home of the heron" in the Sioux language. Lake Okabena is located entirely within the present-day city limits of Worth…Lake Okabena is a small lake located in Nobles County in southwestern Minnesota. It was first noted on a map made by French explorer Joseph Nicollet in 1841, based upon his explorations of the 1830s. The name okabena means "home of the heron" in the Sioux language. Lake Okabena is located entirely within the present-day city limits of Worthington, Minnesota.