Jack Lake is located 5 kilometers from Apsley and one of the areas largest lakes, it has a long tradition of welcoming anglers from around the world with several fishing tournaments each year. It was originally home to bass and trout. As the lake developed as a tourist attraction in its own right, and as a feeder lake within the wider catchment that supports the Trent-Severn Waterway, fish species such as muskie, walleye, rock bass, and perch were also introduced from approximately the 1920s. More recently, Black Crappie have been introduced and are a primary target for summer and winter fisherman. Ongoing provincial and federally supported environmental stewardship and related work experience initiatives occur on the lake from year to year.
The lake has two marinas in brooks bay and a public boat launch located beside Forest Glen Marina. Having a bit of an irregular shape the lake is made up of several bays one of the largest is on the western end of the lake and is known as Sharpe Bay. Jack Lake is located in the township of Havelock-Belmont-Methuen. The lake is approximately 3013 acres in size and has a maximum depth of 140 feet.