Some filmmakers just have incredible timing. This gorgeous, powerful, and timely new film about the environmental impacts of the proposed border wall even features Beto O’Rourke. It tracks a team of five explorers on a 1200-mile journey down the Rio Grande, which marks the southern boundary of Texas and the US–Mexico border, as they seek to experience and capture on film the rugged landscapes of this vast frontier before the border wall changes this part of the river forever. Traveling from El Paso to the Gulf of Mexico on horses, mountain bikes, and canoes, they explore the potential impacts of the wall on the natural environment and come face-to-face with the human side of the immigration debate.