Overmeer is a location on the Vecht river in the Netherlands, situated at the exit point of the Horstermeer. It marks one end of a notable 2-kilometer stretch of the Vecht that runs to Nigtevecht, where the river enters the Aetsveldse Meer.

This section of the Vecht between Overmeer and Nigtevecht has attracted scientific attention for its unusually straight planform.

Despite the presence of meander loops, the channel belt here is strikingly narrow — approximately 150 meters wide — compared to widths of 250 to 1,100 meters found elsewhere in the Angstel–Vecht system.

This constrained lateral migration has led researchers to investigate whether the reach may preserve evidence of an ancient Roman canal, possibly constructed by Drusus.