Basic (free)

The base game comes with seven maps, including some of which has variations to them. (i.e. Winter or at sea)

1) Betty Lake (with Winter variant)

2) Powell Lake

3) Saint Zeno's Lake

4) Baikal Lake (with Winter variant)

5) Atchafalaya Basin

6) Uvac River

7)  Pinas Bay (with 'at sea' variant)