  The Interface Region Imaging Spectrograph (IRIS) mission provides
high-resolution observations of the chromosphere and transition region. We try
to determine whether the light walls exist somewhere else in active regions
besides light bridges. Employing half-year high tempo-spatial data from the
IRIS, we find lots of light walls either around sunspots or above light
bridges. For the first time, we report one light wall near an umbral-penumbral
boundary and another along a neutral line between two small sunspots. These new
observations reveal that these light walls are multi-layer and multi-thermal
structures which occur along magnetic neutral lines in active regions.
