The highway begins in west Bella Vista at Forest Hills Boulevard near the Northwest Arkansas Community College Bella Vista campus.
AR 340 winds past numerous retirement communities and a few lakes on its way through the village.
Approximately halfway along its length, AR 340 intersects US Route 71, which is a four-lane expressway.
The interchange with US 71 is unusual, with long ramps on the northbound side and cramped southbound ramps.
Traffic must exit US 71 and slow immediately to 20 mph (32 km/h) on a 180 degree curve before stopping and gaining access to AR 340.

On the other side of US 71, the highway runs near the Mildred B. Cooper Memorial Chapel, built by local architect E. Fay Jones (in similar style to the Thorncrown Chapel on the National Register of Historic Places).

Highway 340 continues to wind northeast past communities and cul-de-sacs before meeting Pickens Rd, which continues briefly before becoming Missouri supplemental route E.
The highway begins in west Bella Vista at Forest Hills Boulevard near the Northwest Arkansas Community College Bella Vista campus. AR 340 winds past numerous retirement communities and a few lakes on its way through the village. Approximately halfway along its length, AR 340 intersects US Route 71, which is a four-lane expressway. The interchange with US 71 is unusual, with long ramps on the northbound side and cramped southbound ramps. Traffic must exit US 71 and slow immediately to 20 mph (32 km/h) on a 180 degree curve before stopping and gaining access to AR 340.
On the other side of US 71, the highway runs near the Mildred B. Cooper Memorial Chapel, built by local architect E. Fay Jones (in similar style to the Thorncrown Chapel on the National Register of Historic Places).
Highway 340 continues to wind northeast past communities and cul-de-sacs before meeting Pickens Rd, which continues briefly before becoming Missouri supplemental route E.
Arkansas Highway 340