Most of the remaining population of Welsh’s Milkweed is in a park named for these geographical features with a distinct “Coral Pink” color. The largest area in the Arctic with these features is in the south of Alaska’s Kobuk Valley National Park. The intermittent Medano Creek maintains the size of these formations in a national park in the San Luis Valley of the Sangre de Cristo Mountains. The Kelso region is one area where these features are known to (*) “sing.” The largest of these (-5[1])formations made of gypsum (-5[1])are found at a national park designated in 2019 (-5[1])that periodically closes for missile testing. Crescent-shaped barchan ones of these formations contrast with a 750-foot-tall star-shaped one in a national park named for them in Colorado. For 10 points, Indiana’s only national park, on its northern lakeshore, is named what wind-shaped sand formations? (10[2])■END■ (10[1])