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 (15[1])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 formations made of (10[1])gypsum are found at a national park (-5[1])designated in 2019 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? ■END■ (10[1])