The Boyle River is a river of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

. A tributary of the Hope River

Hope River (Canterbury)

The Hope River in Canterbury is one of three rivers by that name in the South Island of New Zealand. It is a tributary of the Waiau River.The Hope River rises at the Hope Pass in the Southern Alps, which is the main divide for the South Island...

, it flows south, then west before curving round to the southeast before joining with the Hope. State Highway 7

New Zealand State Highway 7

State Highway 7 is a major New Zealand State Highway. One of the eight national highways, it crosses the Southern Alps to link the West Coast Region with Canterbury and to form a link between the South Island's two longest highways, State Highway 1 and State Highway 6...

 follows the course of the river for some distance south of the Lewis Pass

Lewis Pass

Lewis Pass is a mountain pass in the South Island of New Zealand.The northernmost of the three main passes across the Southern Alps, it is higher than the Haast Pass, but slightly lower than Arthur's Pass...

; the pass itself is located less than five kilometres to the west of the river's source. The upper reaches of the river form a deep valley between the Opera Range and the Libretto Range.