[{SlideShowNav}] !!!Eastern boundary of American geologic plate [{Image src='120ic.jpg' width='800' alt='Eastern boundary of American geologic plate' class='image_left' height='533'}] [{SET customtitle='Eastern boundary of American geologic plate'}] \\ Almannagja, a large canyon-like fault in Thingvellir National Park, is actually the exposed eastern boundary of the North American geologic plate.