The Econ River flows through Osceola, Orange, and Seminole counties in Central Florida, just east of the Orlando Metropolitan Area (east of State Road 417).

It is theorized that this represents a Muscogee name meaning “earth-mound stream”, with “econ-like” coming from ēkvnv (/iːkaná/), ‘earth, land’, and like (/léyki/), ‘sitting’, plus hvcce (/háčči/), ‘stream’.

Located southeast of Orlando, the swamp is 21 kilometres (13 mi) long, from Lake Conlin to State Road 528.

The river is at its widest (1.6 km) here, bordered by Lake Preston to the west.

Seven miles downstream, the river's elevation is 19 metres (62 ft).