Which famous rock formation is located in Uluru-Kata Tjuta National Park, Australia?

The Ubangi River forms part of the border between which countries? Which river flows through Peru, Brazil, and Colombia before emptying into the Amazon River? Which river flows through Russia, Belarus, and Ukraine before emptying into the Black Sea? Which island nation is home to the famous waterfall, Gullfoss? What is the name of the largest hot spring in the United States, located in Yellowstone National Park? Which famous island is home to the active volcano Kilauea? What is the name of the famous waterfall on the border of Canada and the United States? Which mountain is the highest peak in North America?