Ngarkat Highway South Australia
North end South end
Coordinates	35°18′17″S 140°52′17″E / 35.304739°S 140.871435°E / -35.304739; 140.871435 (North end) 36°15′12″S 140°40′26″E / 36.253236°S 140.673883°E / -36.253236; 140.673883 (South end)
General information
Type	Highway
Length	115 km (71 mi)[1]
Route number(s)	B57 (1998–present)
Major junctions
North end	Mallee Highway Pinnaroo, South Australia
South end	Dukes Highway Cannawigara, South Australia
Location(s)
Region	Murray and Mallee, Limestone Coast[2]
Highway system
Highways in Australia National Highway • Freeways in Australia Highways in South Australia

Ngarkat Highway is a road in the southeastern part of South Australia, connecting Pinnaroo and Bordertown.^[3] It is designated as part of route B57 which continues north from Pinnaroo along Browns Well Highway to Loxton (concurrent with B12 on Mallee Highway for 7km west of Pinnaroo), and south from Bordertown along Naracoorte Road to Naracoorte (concurrent with A8 on Dukes Highway for 10km east of Cannawigara).

The Ngarkat Highway passes through Ngarkat Conservation Park.

LGA[4]	Location[1][3]	km[1]	mi	Destinations	Notes
Southern Mallee	Pinnaroo	0	0.0	Mallee Highway (B12) – Tailem Bend, Lameroo, Ouyen	Northern terminus of highway, route B57 continues north along Mallee Highway for 7km to Browns Well Highway
	Sherwood	61	38	Emu Flat Road – Keith
Tatiara	Cannawigara	104	65	Dukes Highway (A8) – Tailem Bend, Keith, Bordertown, Horsham	Southern terminus of highway, route B57 continues east along Dukes Highway for 11km to Naracoorte Road
Route transition