I love the contours of your landmass (um, that sounds creepy like some Bad Cartographer's pickup line. Hopefully you take the proper meaning). The Oceans and the color scheme give it a nice antique look.

I'd maybe not have gone with a line quite as thick, but if it matches the other map you have used it is fine and doesn't detract or anything anyway.

I'd take things a step further than RP's suggestion and heave the city and ruin icons altogether. I'm no stunning artiste in this sense myself (to create some facsimile of buildings and whatnot) but I see nothing wrong with either a dot (and a triangle for the ruins) or an irregular shaded zone to indicate the city and the surrounding agricultural support area.