Dominated by Chir pine Pinus roxburghii, this subtropical pine forest ecosystem stretches for over 3,000 km along the lower elevations of the Himalayan mountain range, from Pakistan to Bhutan. The region receives most rain from the southwest monsoon. The dominant tree species is Chir pine. The understory is scant, with a few bushes of bayberry and Bengal currant, brambly shrubs of barberry, blackberry, Himalayan raspberry, and smaller wild strawberry. Chir pine occurs from 500 to 2000 m elevation, rarely up to 2300 m, giving way to blue pine P. wallichiana in higher reaches. It tends to have sparse undergrowth and with fire and disturbance may expand into broadleaved forest ecoregions.