Hurricanes pose a severe threat to the area, and the city is particularly at risk because of its low elevation, because it is surrounded by water from the north, east, and south and because of Louisiana's sinking coast. According to the Federal Emergency Management Agency, New Orleans is the nation's most vulnerable city to hurricanes. Indeed, portions of Greater New Orleans have been flooded by the Grand Isle Hurricane of 1909, the New Orleans Hurricane of 1915, 1947 Fort Lauderdale Hurricane, Hurricane Flossy in 1956, Hurricane Betsy in 1965, Hurricane Georges in 1998, Hurricanes Katrina and Rita in 2005, Hurricane Gustav in 2008, and Hurricane Zeta in 2020 (Zeta was also the most intense hurricane to pass over New Orleans) with the flooding in Betsy being significant and in a few neighborhoods severe, and that in Katrina being disastrous in the majority of the city.