What do you call the tower that warns ships in danger?

What lake drains west to the Atlantic and east to the Pacific? What is the distance of miles from the Atlantic coast to the pacific coast? What is bigger Ellis Island or Angel Island? What are the effects of river catchment degradation? What is the longest river in Netherlands? What is the distance from Barrow Street NYC to Times Square? What two people sailed down part of the Mississippi exploring for France? How big is Moosehead Lake in Maine? What does have a mouth on someone mean? does Ohio River run to an ocean? Does Cher have a star on the Hollywood Walk Of Fame? What are the stages of primary succession? Did han wudi build The Great Wall of China? Where is the Yellowstone Historical Society in Billings Montana located? How are woodlands and wetlands alike? When did people started noticing that people were missing at the Bermuda triangle? Which ocean does not border the Caribbean sea? Why does the Saint Johns river travel from south to north? What was daily life like for the priest at mission San Juan Capistrano? Who discovered Yellowstone?