More people were arrested Tuesday near Geln Ullin, North Dakota for protesting the Dakota Access Pipeline. The $3.7 billion project runs through four states, but it’s been most controversial in south-central North Dakota, where it’s slated to run near the Standing Rock Sioux Tribe reservation. The reservation is home to 8,000 people and the issue created both a legal and physical stand-off that’s drawing protesters from all over. It’s also captured the attention of the Obama administration, which last week restricted the company’s access to the site. Check out a map of the proposed pipeline’s approximate route below, with explainers in key areas.