It is primarily an agricultural area consisting of dairy and grain farms.

Dundee is located in the southwestern corner of the Montérégie region of Quebec.

The Salmon River runs through the municipality in a northwesterly direction from the US border to the Saint Lawrence, where many islands also make up Dundee's total area.

In addition to the namesake community along the Salmon River at the United States border, the following locations reside within the municipality's boundaries:[1] The following waterways pass through or are situated within the municipality's boundaries:[1] John Davidson, considered the founder of the municipality, was an early settler along the Salmon River (Rivière aux Saumons).

It is also designated as a Ramsar site and an Important Bird Area (IBA).