To expand on Martin’s example, there is perhaps a little more to it. Refer to pg 106 of Therion Book Such an area could be defined in your scrap drawing by a line border subtype invisible. The area will be called u:filled And definition of colour is identical as definition of blue water in wiki of Therion. So, for an area u:filled, include in your layout… code metapost def a_u_filled (expr p) = T:=identity; thfill p withcolor (0.6, 0.8, 1); enddef; %define the area symbol called filled initsymbol("a_u_filled") %initialise the area symbol called filled def a_u_filled_legend = a_u_filled<oops, I cannot find the code for this right now, but it should be simple – fills box with colour> enddef; %to include the u:filled symbol in the legend endcode To select a colour definition you could refer to https://therion.speleo.sk/wiki/tips#rgb_to_therion_colour_mapping_calculator And to define the text you want to appear in the legend, include this in your thconfig… text en “area u:filled” “filled passage” text de “area u:filled” “german words for filled passage” Bruce