Mont Mégantic is a monadnock

Monadnock

A monadnock or inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain...

 located in Québec

Quebec

Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, about 15 km north of the border between Québec and the U.S.

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 states of Maine

Maine

Maine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...

 and New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

.
Mégantic is on the border of the regional county municipalities

Regional county municipality

The term regional county municipality or RCM is used in Quebec to designate one of 86 county-like political and geographic units. In most cases, they are also census divisions. Regional County Municipalities are a supralocal type of "Regional Municipality" and are still commonly referred to as...

 of Le Granit

Le Granit Regional County Municipality, Quebec

-References:...

 and Le Haut-Saint-François

Le Haut-Saint-François Regional County Municipality, Quebec

-References:...

.
Its summit is the highest point of the latter.
Many geologists believe that Mont Mégantic is a member of the Monteregian Hills formed by the New England hotspot

New England hotspot

The New England hotspot, also referred to as the Great Meteor hotspot, is a long-lived volcanic hotspot in the Atlantic Ocean. The hotspot's most recent eruptive center is the Great Meteor Seamount, and it probably created a short line of mid to late-Tertiary age seamounts on the African Plate but...

, as it has the same mechanism and depth of intrusion

Intrusion

An intrusion is liquid rock that forms under Earth's surface. Magma from under the surface is slowly pushed up from deep within the earth into any cracks or spaces it can find, sometimes pushing existing country rock out of the way, a process that can take millions of years. As the rock slowly...

.
Mont Mégantic stands within the watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 of the Saint Lawrence River

Saint Lawrence River

The Saint Lawrence is a large river flowing approximately from southwest to northeast in the middle latitudes of North America, connecting the Great Lakes with the Atlantic Ocean. It is the primary drainage conveyor of the Great Lakes Basin...

, which drains into the Gulf of Saint Lawrence

Gulf of Saint Lawrence

The Gulf of Saint Lawrence , the world's largest estuary, is the outlet of North America's Great Lakes via the Saint Lawrence River into the Atlantic Ocean...

.
The east side of Mégantic drains into Rivière Victoria, thence into Lac Mégantic, the Chaudière River

Chaudière River

The Chaudière River is a long river with its source near the Town of Lac-Mégantic, in southeast Quebec, Canada. From its source Lake Megantic in the Chaudière-Appalaches region, it runs northwards to flow into the St. Lawrence River opposite Quebec City...

, and the St. Lawrence.
The rest of Mégantic drains into Rivière Au Saumon (Salmon River), thence into the Saint-François River

Saint-François River

The Saint-François River is a river in the Canadian province of Quebec.The Saint-François takes its source from Lake Saint-François in Chaudière-Appalaches, southeast of Thetford Mines...

, and the St. Lawrence.
Observatoire

Observatory

An observatory is a location used for observing terrestrial or celestial events. Astronomy, climatology/meteorology, geology, oceanography and volcanology are examples of disciplines for which observatories have been constructed...

 du Mont Mégantic

Mont Mégantic Observatory

The Observatoire du Mont-Mégantic is an astronomical observatory owned and operated jointly by the Université de Montréal, the Université Laval and the McGill University...

 (OMM) is located on the mountain's summit, which is the highest point in Québec accessible by road.
The mountain is in the middle of the 55 km² Parc national du Mont-Mégantic.
The annual Tour de Beauce

Tour de Beauce

Tour de Beauce is a men's elite professional road bicycle racing multi-day event held each June in the Beauce region of Quebec, Canada since 1986...

 bicycle race

Road bicycle racing

Road bicycle racing is a bicycle racing sport held on roads, using racing bicycles. The term "road racing" is usually applied to events where competing riders start simultaneously with the winner being the first to the line at the end of the course .Historically, the most...

is routed over Mont Mégantic.