Does doldrums lies between 30degree and 40degree north?

No, the doldrums, also known as the Intertropical Convergence Zone (ITCZ), lies between approximately 5 degrees north and 5 degrees south of the equator. This region is characterized by calm winds and often leads to significant rainfall. The area between 30 and 40 degrees north is typically associated with the prevailing westerlies and is not part of the doldrums.