Etna is a small town in New Hampshire, United States. It is near Hanover and the Connecticut River. Official language(s) English Capital Concord Largest city Manchester Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 46th 24,239 km² 110 km 305 km 3. ... Dartmouth Colleges Baker Library is a prominent feature at the center of Hanover Located on the Connecticut River in the state of New Hampshire, United States, Hanover has a population of 10,850. ... The Connecticut River as seen from the French King Bridge in western Massachusetts. ...