Hard Telling Not Knowing each week tries to answer your burning questions about why things are the way they are in Maine — specifically about Maine culture and history, both long ago and recent, large and small, important and silly. Send your questions to eburnham@bangordailynews.com .

With nearly 4 million visitors per year, you’d think people today know everything there is to know about Acadia National Park. And yet, there’s seemingly always something new to learn, from its colonial history that’s distinct from the rest of New England to the natural wonders hidden in secret corners all over Mount Desert Island. Here are five little-known facts about Acadia, one of the most-visited national parks in the country.

Somes Sound cleaves a long, deep trough down the center of Mount Desert Island, stretching nearly 5 miles from the village of Somesville to the towns of Southwest Harbor and Northeast Harbor at its mouth. For many years, Somes Sound was called a fjord, due to its depth — more than 100 feet in some places — and the cliffs that surround it, as well as the fact that it was carved out by glaciers. One of Acadia’s many selling points to tourists is that they could visit the only fjord on the East Coast of the U.

S. In 1998, however, a report by the Maine Geological Survey pointed out that it’s inaccurate to call Somes Sound a fjord. The 1,000-foot elevations surrounding it are far shorter than the 3,000 to 4,000 foot cliffs seen in Norwegian fjords, which a.