The Week’s guide to what’s worth watching

The best programs on TV this week

Drain the Great Lakes

If we could pull a plug on the largest freshwater system on Earth, what would we see? In this eye-opening special, computer imaging maps the floors of the Great Lakes in great detail, allowing close-up views of such features as an ancient waterfall, valleys carved by glaciers, and even such traces of human history as the wreck of the freighter the Edmund Fitzgerald. Monday, Dec. 23, at 7 p.m., National Geographic Channel

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