"kilometer stretch" is correct and usable in written English.
You can use it to refer to a distance that is measured in kilometers. For example, "The path followed a 10 kilometer stretch along the beach."
All the shops on a two kilometer stretch on the Dilsukhnagar main road were shuttered down all day today.
There is the maritime argument: More than half of the world's merchant fleet tonnage passes through the straits around Indonesia, including the vital 805 kilometer stretch of water between Peninsular Malaysia and the Indonesian island of Sumatra, known as the Strait of Malacca.
Rebuild it or at least a virtual two kilometer stretch.
It took Shaw only 12 minutes, less than half the time it takes to drive the seven kilometer stretch.
Nestled to the northwest of the Island of New Guinea, within Indonesia's West Papua Province, there is a 46,000 square kilometer stretch of ocean spotted with a stunning chain of small islands named Raja Ampat (the Four Kings).
NAIROBI, KENYA, 11 November 2009 - Somali children and women received a high-impact life-saving health package during the Child health Days Campaign in the Afgoye Corridor, a 30 kilometer stretch of road west of Mogadishu and the world's most densely populated settlement for the displaced.
In 2008, 73 people were killed on just this 27-kilometer stretch of highway, earning it the nickname "Expressway to Death".
The most polluted part of the Yamuna starts from the Wazirabad barrage, a type of dam, to Okhla barrage, a 22-kilometer stretch in New Delhi.
Tracks have yet to be laid down for the most daunting part of the train project, a 148-kilometer stretch through very high mountains between the Jawahar Tunnel at Banihal and Katra town in southern Jammu province.
Mr. Yasin and his son made their journey a few days after Prime Minister Manmohan Singh inaugurated an 18-kilometer stretch that has been added to a train line running through the valley in late June.
The plan is to have 10 bus lines run in four lanes over a three-kilometer stretch of 9 de Julio Avenue and replace the tree-lined medians with modern bus shelters.
