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Impact

Together with our 2800 members and 200 volunteers, we...

  • Conserve and care for over 4300 acres of fields, forests, and farms in the 36 communities surrounding the Assabet, Sudbury, and Concord Rivers.
  • Maintain more than 55 miles of hiking trails.
  • Help friends and neighbors connect with nature through our events, programs, and outings.
  • Assist local organizations in their efforts to protect the region’s most important natural areas.

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Stewardship Projects

Land Protection

Upcoming Programs

September 9, 2017 10:30am to 12:00pm
Upper Mill Brook and Peace Lutheran Church, Wayland

Stay Connected

 

Take a Hike

A view along the orange trail from Forty Caves in Berlin.
A view along the orange trail from Forty Caves in Berlin.

Striking features catch your eye as you explore this conservation area. North Brook rattles and gurgles, slipping under a flat slab of rock and widening into a quiet pool on its way through the property and eventually to the Assabet River.

Trails narrow to squeeze between rock outcroppings. Glacial erratics punctuate the woodlands. Granitic gneiss spotted with feldspar crystals provide evidence that the glacier plucked some of these boulders from cliffs that lie just north of the conservation area. Steep cliffs in Berlin's portion of the conservation area overlook a marsh and stream that makes its way to North Brook. A view from the opposite side, along the orange trail near Allen Road, looks towards the namesake of the conservation area - caves created by tumbled boulders and rock slabs that lean together.

The geology of this site is spectacular. In addition, the Clinton-Newbury fault is visible at several points. The rock here is tightly folded and crinkly, different from the granitic gneiss found elsewhere in the conservation area.

In 2017, SVT and the Towns of Berlin and Clinton teamed up to conserve an additional 63 acres of property that spans the two towns and abuts 193 acres of conservation land, including lands owned by SVT and the Town of Berlin.  Read about the successful effort to protect this property.

Trails on the property are accessible from parking areas on Allen Road in Berlin and on Francis Street in Clinton.

PDF icon Forty Caves Trail Map

Nature Sightings

A mute swan in Stow, photographed by Wayne Hall.
A mute swan in Stow, photographed by Wayne Hall.

August 8, 2017

Wayne Hall photographed this mute swan nesting on the Assabet River in Stow.

Green herons at their nest in Sudbury, photographed by Russ Place.
Green herons at their nest in Sudbury, photographed by Russ Place.

August 6, 2017

Russ Place photographed these green herons at their nest in Sudbury.

A monarch caterpillar in Sudbury, photographed by Dave Longland.
A monarch caterpillar in Sudbury, photographed by Dave Longland.

August 5, 2017

Dave Longland photographed this monarch caterpillar feasting on butterflyweed seed pods that he raised in Sudbury.

An orchard oriole in Southborough, photographed by Steve Forman.
An orchard oriole in Southborough, photographed by Steve Forman.

August 4, 2017

Steve Forman photographed this orchard oriole at Breakneck Hill Conservation Land in Southborough.