Editing Middlesex County, Massachusetts (section)

==Geography==
According to the [[U.S. Census Bureau]], the county has a total area of {{convert|847|sqmi}}, of which {{convert|818|sqmi}} is land and {{convert|29|sqmi}} (3.5%) is water.<ref name="GR1">{{cite web|url=https://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_25.txt|publisher=United States Census Bureau|access-date=September 16, 2014|date=August 22, 2012|title=2010 Census Gazetteer Files|url-status=dead|archive-url=https://archive.today/20140914175857/http://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_25.txt|archive-date=September 14, 2014}}</ref> It is the third-largest county in Massachusetts by land area.

It is bounded southeast by the [[Charles River]] and drained by the [[Merrimack River|Merrimack]], [[Nashua River|Nashua]], and [[Concord River|Concord]] rivers, and other streams.<ref>{{Cite AmCyc|wstitle=Middlesex (United States)|display=Middlesex: I. A N. E. county of Massachusetts}}</ref>

The [[MetroWest]] region comprises much of the southern portion of the county.

===Adjacent counties===
*[[Hillsborough County, New Hampshire]] (north)
*[[Essex County, Massachusetts|Essex County]] (northeast)
*[[Suffolk County, Massachusetts|Suffolk County]] (southeast)
*[[Norfolk County, Massachusetts|Norfolk County]] (south)
*[[Worcester County, Massachusetts|Worcester County]] (west)

===Transportation===
These routes pass through Middlesex County
*{{jct|state=MA|I|90}}, From Hopkinton to Newton
*{{jct|state=MA|I|93}}, From Somerville to Tewksbury
*{{jct|state=MA|I|95}}, From Newton to Wakefield 
*{{jct|state=MA|I|290}}, In Marlboro
*{{jct|state=MA|I|495}}, From Hopkinton to Tewksbury
*{{jct|state=MA|US|1}}, From Cambridge to Malden
*{{jct|state=MA|US|3}}/[[Massachusetts Route 3|Route 3]], From Cambridge to Tyngsborough
*{{jct|state=MA|US|20}}, From Marlborough to Watertown 
*{{jct|state=MA|MA|2}}, From Littleton to Cambridge 
*{{jct|state=MA|MA|2A}}, From Shirley to Cambridge
*{{jct|state=MA|MA|3A}}, From Burlington to Tyngsborough 
*{{jct|state=MA|MA|4}}, From Lexington-Arlington line to Chelmsford
*{{jct|state=MA|MA|9}}, From Framingham to Newton 
*{{jct|state=MA|MA|13}}, In Townsend 
*{{jct|state=MA|MA|16}}, From Holliston to Everett
*{{jct|state=MA|MA|27}}, From Sherborn to Chelmsford 
*{{jct|state=MA|MA|28}}, From Cambridge to North Reading
*{{jct|state=MA|MA|30}}, From Framingham to Newton 
*{{jct|state=MA|MA|31}}, In Ashby
*{{jct|state=MA|MA|38}}, From Somerville to Dracut
*{{jct|state=MA|MA|40}}, From Groton to Chelmsford 
*{{jct|state=MA|MA|60}}, From Waltham to Malden
*{{jct|state=MA|MA|62}}, From Hudson to North Reading
*{{jct|state=MA|MA|85}}, From Hopkinton to Hudson
*{{jct|state=MA|MA|99}}, From Everett to Melrose
*{{jct|state=MA|MA|110}}, From Ayer to Dracut
*{{jct|state=MA|MA|111}}, From Concord to Pepperell 
*{{jct|state=MA|MA|113}}, From Pepperell to Dracut
*{{jct|state=MA|MA|115}}, In Sherborn
*{{jct|state=MA|MA|117}}, From Stow to Waltham
*{{jct|state=MA|MA|119}}, From Concord to Ashby 
*{{jct|state=MA|MA|125}}, From Wilmington to North Reading 
*{{jct|state=MA|MA|126}}, From Holliston to Concord
*{{jct|state=MA|MA|128}}, From Newton to Wakefield
*{{jct|state=MA|MA|129}}, From Chelmsford to Wakefield
*{{jct|state=MA|MA|133}}, From Lowell to Tewksbury
*{{jct|state=MA|MA|135}}, From Hopkinton to Natick
*{{jct|state=MA|MA|225}}, From Shirley to Lexington

===National protected areas===
* [[Assabet River National Wildlife Refuge]]
* [[Great Meadows National Wildlife Refuge]]
* [[Longfellow House–Washington's Headquarters National Historic Site]]
* [[Lowell National Historical Park]]
* [[Minute Man National Historical Park]]
* [[Oxbow National Wildlife Refuge]] (part)