Released last Christmas, the Kickstarter funded documentary Herd in Iceland focuses on the country’s regional annual roundups where horses are gathered from the highlands after being let free to roam during the warmer months. It clocks in around 30 minutes, and I recommend getting the HD download from Vimeo over the DVD option.
The folks involved with the production have received some positive press over the past few years for their photography, which has been featured in both the Big Picture and Lens as well as a number of other print publications.