Basically the shoreline of any "port territory" ( you will notice there is no longer that name on the map) has been blended into the lake. Plus the arrows have been modified to reflect the colors of the two adjacent attacking territories. Whether they be land or lake.

I feel this is well within the feel of the map and does allow the text for explaining the borders to go away. The arrows are easy to understand but they do not really stand out. Once you look at the map they are easy to see and explain well.