Code to generate regional boxes in maps with Basemap. It can be implemented in carroty by replacing the map function with the corresponding one.

regional_box_in_map.py

# Pacific,Indian, Atlantic
# Values correspond to the corners of the box.
x_areas=[[150,150,288,288],[40,40,150,150],[325-360,325-360,10,10]]
y_areas=[[-48,-62,-62,-48],[-44,-57,-57,-44],[-46,-56,-56,-46]]

for a_ind in range(len(x_areas)):
    #Initial position of box
    A_x=[x_areas[a_ind][0]]
    A_y=[y_areas[a_ind][0]]
    #Append each degree a new point in the x and y direction.
    [A_x.append(ii) for ii in arange(x_areas[a_ind][1],x_areas[a_ind][2]+1)]
    [A_y.append(y_areas[a_ind][1]) for ii in arange(x_areas[a_ind][1],x_areas[a_ind][2]+1)]
    [A_x.append(ii) for ii in flipud(arange(x_areas[a_ind][1],x_areas[a_ind][2]+1))]
    [A_y.append(y_areas[a_ind][-1]) for ii in arange(x_areas[a_ind][1],x_areas[a_ind][2]+1)]
    
    #Plot corresponding lines.
    A_xm,A_ym=map(array(A_x),array(A_y))
    map.plot(A_xm,A_ym,'--',linewidth=2, color='gold')