Mark your calendars now and plan to attend the Nashua River Watershed Association's guided walks this November.

Surrenden Farm in Groton -- Sunday, Nov. 4, from 1 to 2 p.m.; guided by Stacey Chilcoat, river classroom director

Oxbow National Wildlife Refuge in Harvard -- Sunday, Nov. 18, from 1 to 2 p.m.; guided by Al Futterman, land programs director

Trails have been selected for ease of walking for general public -- all ages are welcome. Hikes are approximately one hour long and cover roughly 2 miles. No dogs please.

The hikes are free and open to the public, funded in part by a grant from the Nashoba Valley Community Healthcare Fund. Registration is encouraged for planning purposes. For details visit Upcoming Programs and Events at www.NashuaRiverWatershed.org. To register contact Futterman at 978-448-0299.