I like the idea of a lake that cannot be used for economy purposes. No fish in a polluted lake was an original theme.
Visual Appeal: 4
I generated the map 3 times and there were roads scattered about, the lake itself had a unique shape like a smaller baltic.
1st time I generated the map it was 2 v 2 on the standard 4 player sized map. 2 of the players were completely walled in by trees with very little space to build. In a 200 population game these players would not have been able to trade with each other or have enough room to build houses. The 3rd time the map was generated, I tried 2 vs 2 on the giant sized map and found that no players were locked in by trees. However there was only 1 player with starting berries.
This map needs to be play tested further and cannot be used for an enjoyable single or multiplayer game.