Here's a few:
Huge:
2031696358

- Bofeak.citymm.png (92.6 KiB) Viewed 117633 times
This was one of the first theotown maps I ever played on, actually, back in 221 I think. It is a very nice river meets Ocean map. The north shore hase a nice peninsula at the west side that can be turned into an island if needed. The other map is similar, but with the south shore. It's not perfect but you won't have to edit much in it.
Giant:
1142580479

- Taar.citymm.png (373.19 KiB) Viewed 117633 times
Similar to the previous one, but on a giant map. Also, like the previous, it isnt perfect. It's still is easy to fix and fun to play on. I like building coastal port cities. If you want harbors, you would probably like these two maps.