"stretch miles" is correct and usable in written English.
You can use it to refer to a large distance or span. For example, "The coastline of this country stretches miles and miles."
In between, stretch miles of open fields surrounded by stone walls and expansive vistas over rivers and steep gorges.
"Companies are now drilling multiple wells on a single well pad, and these are wells that can stretch miles underground, greatly reducing the surface land footprint".
Lines for gasoline stretch miles and miles.
They stretched miles and miles.
The sites will require new walls stretching miles into the sea.
The town sits smack in the middle of a USDA food desert stretching miles in every direction.
Extensive patrols by UNMISS over the past three weeks have not found the "trail of corpses" stretching "miles into the bush," as alleged in some press reports.
It is likely to grow further: land stretching miles into the jungle has already been divided into lots.The population boom brings relief and strain.
A company has unveiled plans for huge lagoon power plants, stretching miles into the sea, to harness tidal energy and turn it into electricity.
Behind him stretches mile upon mile of grey Atlantic.
The municipality is a vast sprawl of factories, many of them Taiwanese, stretching mile after mile through what were tiny villages a few years ago.
