A Michigan couple has completed a quest to visit all 3,108 counties in the lower 48 states — closing out the task with their trip to Nantucket.

Jennifer and Jonathan Riehl completed their journey this week when they boarded a ferry to the island.

The Riehls, of Hancock, Michigan, have done it all in the same vehicle — a green 1999 Dodge Intrepid with more than 540,000 miles.

They tell the Cape Cod Times (http://bit.ly/1F2fecz ) they have had their share of adventures, including encounters with bears and extreme weather, including an avalanche, a landslide, and blizzards.

They started in 2006 with small trips, and Jennifer Riehl, a research scientist, and her husband, an engineering instructor, now typically drive about 50,000 miles a year.

Their next goal is to finish visiting the counties in Alaska, and start on Hawaii.

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Information from: Cape Cod (Mass.) Times, http://www.capecodonline.com