The selected location is:

The elevation is 18 m ( 59 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 0.4 or slight
The location as decimal degrees (X,Y;Z) = -71.3056, 42.6465; 18 m

The state and county are Massachusetts: Middlesex County 25017
The HUC is Merrimack 01070002; Place point in HUC
The Omernik ecoregion is Northeastern Coastal Zone (more typical) 59
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Nearby named places (in order by distance)

1. Massachusetts Wasteway; Massachusetts: Middlesex Co. -71.3056, 42.6465 at a distance of 1 m
2. Eastern Canal; Massachusetts: Middlesex Co. -71.3062, 42.6462 at a distance of 60 m
3. Massachusetts Mill; Massachusetts: Middlesex Co. -71.3045, 42.6462 at a distance of 96 m
4. Middlesex Canal; Massachusetts: Middlesex Co. -71.3078, 42.6459 at a distance of 192 m
5. Boott Mills; Massachusetts: Middlesex Co. -71.3073, 42.6482 at a distance of 234 m
6. Concord River mouth; Massachusetts: Middlesex Co. -71.3026, 42.6465 at a distance of 246 m
7. Pawtucket Canal; Massachusetts: Middlesex Co. -71.3059, 42.6443, ( 95 ft ) at a distance of 247 m
8. Central Bridge; Massachusetts: Middlesex Co. -71.3051, 42.6490 at a distance of 280 m
9. Lower Locks; Massachusetts: Middlesex Co. -71.3076, 42.6443 at a distance of 295 m
10. Boott Mill Boarding House; Massachusetts: Middlesex Co. -71.3087, 42.6482 at a distance of 316 m

The 7.5 minute series topographic maps for that area