 High shear explains why no cyclones can form in the Red Sea, which possesses the necessary depth, vorticity and surface temperatures year-round.Rarely do tropical cyclones that form elsewhere in this basin affect the Arabian Peninsula or Somalia; however, Cyclone Gonu caused heavy damage in Oman on the peninsula in 2007.Although the North Indian Ocean is a relatively inactive basin, extremely high population densities in the Ganges and Ayeyarwady Deltas mean that the deadliest tropical cyclones in the world have formed here, including the 1970 Bhola cyclone, which killed 500,000 people.