"extend between" is a correct and usable phrase in written English.
It typically means to stretch or reach between two points or areas. Example: The river extends between the two mountains and provides a scenic view for hikers.
Highway and railway connections extend between the larger towns in the county.
Highway and railway connections, usually parallelling river courses, extend between the county's major towns.
Two tubes, the archinephric, or Wolffian, ducts, extend between the body cavity and the back and lead to the exterior.
The first three muscle layers extend between the vertebral column behind, the lower ribs above, and the iliac crest and pubis of the hip bone below.
Above monotremes the follicular epithelium appears to be many cells thick; in at least one species, however, this is considered an artifact, and all granulosa cells are said to extend between the outer boundary of the epithelium and the oocyte.
The heavily glaciated Boundary Ranges along the Alaska-Canada border extend between the Skagway River at the northern end of Alaska's Inside Passage southward to the Portland Canal southeast of Ketchikan.
The Chihuahuan Desert, and extending between the United States and Mexico, is both a bridge and a barrier.
It extends between Liguria and Tuscany (north and east) and the French island of Corsica (south).
An unimproved road extends between San José del Guaviare and northern points such as Bogotá.
In the vertical, tree-of-knowledge tradition, the tree extends between earth and heaven.
The hours are from 10 a.m. to 5 p.m., and some are extended between Thanksgiving and Christmas.
