Twin Lakes itself contains several smaller islands within the body of water.

Twin Lakes is in the eastern half of the island, located slightly more than one mile (1.6 km) north of Pointe aux Pins, the Bois Blanc island dock and settlement.

About 75% of the lake's shoreline is owned by the State of Michigan, largely as siltland or lowland brush.

For fisheries management purposes, the Michigan Department of Natural Resources deployed gill nets in July 2012 to see which fish were found in the lake.

The lake was found to be populated by large quantities of panfish, with the most common species being pumpkinseed sunfish.