def find_mask(location):
    """ Returns a mask filepath for given location """
    mask_dic = {'ngari': '_Data/Masks/Ngari_mask.nc',
                'khyber': '_Data/Masks/Khyber_mask.nc',
                'gilgit': '_Data/Masks/Gilgit_mask.nc',
                'uib': '_Data/Masks/ERA5_Upper_Indus_mask.nc',
                'sutlej': '_Data/Masks/Sutlej_mask.nc',
                'beas': '_Data/Masks/Beas_mask.nc',
                'beas_sutlej': '_Data/Masks/Beas_Sutlej_mask.nc'}
    mask_filepath = mask_dic[location]
    return mask_filepath