Each week, Michigan Lakes Team will be featuring a certain lake in Southwest Michigan. We hope this information will help give you a better feel for each lake, what it has to offer and how you could imagine yourself living there. You can view all Southwest Michigan lake homes for sale on each lake, too.At nearly 1050 acres, Diamond Lake is the largest lake in southwest Michigan. Cassopolis is a short drive to Notre Dame in South Bend, IN and only 2 hours to Chicago. Situated near all of the charm of the Michigan Wine Country, Diamond Lake is a resort lake for year-round and vacationers alike. Diamond Lake even has its own 43 acre occupied island, accessible by ferry. With its sandy beach, marina, and public access area, Diamond Lake is a popular destination. Day trips are plentiful ... 09/26/2008