A noteworthy feature of the metropolitan public water service was begun in 1896 in the Wachusett lake reservoir at Clinton, on the Nashua river.
Mt Lincoln (1246 ft.) and especially Mt Wachusett (2108 ft.), to the east in a level country, are very exceptional.
Monadnock (in New Hampshire, nearN.E.Massachusetts), the Blue Hills near Boston, Greylock, in the north-west, and Wachusett in the centre, are the most commanding remnant-summits (known generically as " Monadnocks ") of the original mountain system.
It has secured as public reservations the summit and sides of Greylock (3535 ft.) in the north-west corner of the state, and of Wachusett (2108 ft.) near the centre.
Corner of the township is now part of an immense water reservoir, the Wachusett dam and reservoir (excavated 1896-1905; circumference, 35.2 m.), on the S.
"Wachusett" in the neutral harbour of Bahia (October 7, 1862).
The storage capacity is exceeded by probably but one reservoir in the world - the Wachusett reservoir near Boston.