The US coastline between Maine and the Gulf of Mexico was accurately measured for the first time in the 1840s. The director of the survey was Alexander Bache, great-grandson of Benjamin Franklin. Alexander Bache invented a tool known as the "Bar of Invariable Length" that allowed this survey to take place. The baseline at Edisto was the third of seven lines measured. The baseline markers still exist on Edisto, the oldest intact baseline. Two endpoint markers are still in existence on Edisto Island.

This easy .2-mile trail takes you from the Environmental Learning Center to one of only two remaining Bache markers on Edisto Island. Winding along Big Bay Creek, you will find several informative waysides guiding you to this historic monument. The Big Bay Trail is also nearby, if you would like to extend your hike/ride.

Camping: Call 1-866-345-PARK (7275) or go online at www.SouthCarolinaParks.com to make your reservations today!

From Highway 17: Take Hwy 174, 28 miles to entrance of the town of Edisto Beach. As you enter the town limits, the entrance to the park will be on your left.