Bear Island Lake is a lake which is about 15 miles southwest of Ely in the U.S. state of Minnesota. The lake measures 2,351 acres, or about 2 miles by 4 miles. There are at least 20 other islands in the lake. The shoreline of the natural glacial lake is about two-thirds state and national forest, including Bear Island State Forest. While deep in parts, several shall…Bear Island Lake is a lake which is about 15 miles southwest of Ely in the U.S. state of Minnesota. The lake measures 2,351 acres, or about 2 miles by 4 miles. There are at least 20 other islands in the lake. The shoreline of the natural glacial lake is about two-thirds state and national forest, including Bear Island State Forest. While deep in parts, several shallow bays and natural sand beaches make it a popular swimming spot.